This is an extension to the Washington Street Sketch article, further examining the age of the Zodiac Killer in 1969. Many people have argued that the Zodiac Killer, through four attacks, wasn't one individual because of the varying age estimations, differing from 26-30 by Michael Mageau, 20-30 by Bryan Hartnell (voice concept) and 25-30 by the three teenagers at Presidio Heights, up to 35-45 by Officer Donald Fouke and about 40 by the Julius Khan playground eyewitnesses. However, this really isn't the case when we consider that Michael Mageau's testimony cannot be relied upon, bearing in mind he was blinded by the light from the assailant's vehicle and flashlight, while being shot in the head. His recollection of the events are unclear, with probably less than a second to make a visual on the suspect's face. In the following attack at Lake Berryessa, Bryan Hartnell never saw the suspect's face at all, so we only have a recollection of "voice concept", which in essence means very little. The only attack where the Zodiac Killer's face was seen for any reasonable length of time was on October 11th 1969. At Presidio Heights there were three sets of eyewitnesses who saw the Zodiac Killer from the taxicab to the park - and all gave the same age. The three teenagers described a man in his early forties, Officer Donald Fouke described the man as 35-45 (therefore a median age of 40) and the Julius Khan playground eyewitnesses described the man running into the park as about 40. Three sets of eyewitnesses pinpointing the Zodiac Killer as 40 years of age or slightly above, within a five minute window.

We can of course throw away or disregard the last sighting of a man running into the park and matching the other two descriptions, if our theory revolves around the Zodiac Killer never entering the park or getting into a vehicle along Jackson Street, but this again relies on cherry-picking the evidence to suit our theory, rather than let the evidence or eyewitness testimony become the driver.

The three teenagers never described the suspect as 25-30 years - only the October 13th 1969 police sketch did. Their account was comprehensively detailed in the police report countersigned by Officer Armond Pelissetti on October 12th 1969. Their viewing of the suspect "last seen walking north on Cherry Street, from Washington Street" was the only eyewitness testimony in the police report, and therefore the suspect description on page 2 could only have been derived from them. It started the man was in his early forties. It couldn't have been from the other two sets of eyewitnesses because the police report clearly states that the suspect was "last seen walking north on Cherry Street, from Washington Street". The other eyewitnesses viewed the suspect after Cherry Street.

The three teenagers sat down with a sketch artist who interpreted their description of the man - and it's extremely likely that because the sketch was interpreted and drawn looking younger, the police attributed the age range of 25-30 years to it - likely believing this was the correct course of action based on the appearance of the sketch. In other words, the contradiction of the three teenagers early forties description in the police report to the appearance of the sketch, likely played a part in the revision of the age range placed on the wanted poster. However, it is apparent that the three teenagers were not happy with the first sketch, forcing the police to create an amended sketch more in line with their original early forties description. The police then released the amended sketch on October 18th 1969 with a compromise age range of 35-45 years, which allowed for any slight error either way.      

If we factor in Officer Donald Fouke's description of a man "older and heavier" with a "lumbering gait", possibly "graying in the rear" with a "widows peak", we could be looking at a much more mature Zodiac Killer. A killer who described David Faraday (17), Betty Lou Jensen (16), Michael Mageau (19) and Darlene Ferrin (22) as boy, girl and kids in his initial correspondence. Our suspect is unlikely to be a young man aged between 25-30 years, addressing a 19 and 22-year-old as a boy, girl or kid. The way the Zodiac Killer addressed the couple at Blue Rock Springs Park suggests more of a generational divide.

Here is an excerpt by Donn Devine: "But just how long is a generation? Don’t we all know as a matter of common knowledge that it generally averages about 25 years from the birth of a parent to the birth of a child, even though it varies case by case? And wasn’t it closer to 20 years in earlier times when humans mated younger and life expectancies were shorter? Where did those numbers come from? Several recent studies by a sociologist-demographer and groups of population geneticists and biological anthropologists show that male-line generations, from father to son, are always longer on average than female-line generations, from mother to daughter. They show, too, that both are longer than the 25-year interval that conventional wisdom has assigned to a generation. The male generation is at least a third longer, the female generation is longer by perhaps half that amount".

Most people affix around 20-25 years to a generation, so if we took the average of the four victim's ages from the first two attacks, we would arrive at 19 years. Add the generational divide of 20-25 years and we have a suspect between 39-44 years of age - a man in his early forties or about 40. We know the attack at Presidio Heights was a Zodiac crime because of the blooded piece of taxicab driver Paul Stine's shirt being mailed to the San Francisco Chronicle, therefore these three sets of eyewitnesses, in a time window of just five minutes, all describing a man about 40 years of age should carry great value. But does this argument have any sway with the long-held convictions of people regarding suspects in the Zodiac case, or will no amount of eyewitness testimony cloud the lens through which they view the Zodiac case?

In 1969, the ages of the most widely touted suspects were: Theodore Kaczynski (27), Bruce Davis (27), Gareth Penn (28), Ross Sullivan (28), Richard Gaikowski (33), Arthur Leigh Allen (35), Richard Marshall (41), Lawrence Kane (45) and Kjell Qvale (50). Based on the eyewitness testimony at Presidio Heights, only two candidates fit the age description of the Zodiac Killer and these are poor suspects at best. The farther we travel to either end of the suspect age-scale spectrum, the weaker the argument becomes for these men to be the infamous Zodiac Killer. People often defy their years, but the argument still stands.
We have multiple eyewitnesses at Presidio Heights, all of whom were able to give fairly detailed descriptions of a killer emerging from the taxicab, heading up Cherry Street, turning into Jackson Street, before seeking refuge in the Presidio Park just after 10:00 pm. The question is, what faith do you have in three corroborating sets of eyewitnesses?   

Geographic profiling ia an invaluable tool for mapping the probable location where an offender most likely lives. This offender, like all of us, has areas of familiarity with respect to their profession and personal life that governs one's comfort zone, and therefore the commuter routes they opt for. These are factored into their way of thinking when considering any crimes that are to be committed or the areas where an offender may conceal a body. There is a delicate balance to be struck between the least effort principle (expenditure of the least amount of effort to accomplish a task) and the buffer zone (where an offender will avoid committing crimes too close to their home). In other words, they don't want to focus the attention around the place they live, but may equally not want to expend the effort in traveling a great distance, thereby creating a mental map of a target zone - usually somewhere with which they have a familiarity. Of course, factors such as their working week will affect the distance they are prepared to travel on any given day.

​This mental map was considered in the article Seventy One Days of Terror from October 11th 1969 to December 20th 1969, analyzing confirmed and unconfirmed letters, phone calls, murders and proposed murders during this time period. It became apparent that the locations targeted during this period, that included Sacramento, Fairfield, Vallejo, Oakland, San Francisco, Palo Alto and San Jose, all have Interstate 80 and U.S. Route 101 running directly through them. This may give us a clue to the areas where the Zodiac Killer was most comfortable. If he frequented these areas regularly in his profession, then this could very well influence the newspapers he read and the stories he became interested in. The case of murder victim Reet Jurvetson in a previous article, another example of a crime conforming to the above criteria. He may not have murdered this young woman, but was familiar with the area in which she was murdered, which ultimately governed his decision to choose her as victim number eight - allied to his new found fascination of knife crime. She too was brutally stabbed 157 times and unceremoniously dumped down a ravine off Mulholland Drive in Los Angeles. Her body was discovered just 2 miles from U.S. Route 101.           

When the Zodiac Killer failed to acquire the "front page coverage" he craved, he may have drew inspiration from the murders of Debra Gaye Furlong (14) and Kathy Ann Snoozy (15), who were found brutally stabbed and murdered on August 3rd 1969 in the Bay Area of San Jose. They each had suffered in excess of 100 knife wounds that can only be described as savagery. In less than two months he would arrive on the shores of Lake Berryessa armed with a 12-inch bayonet. The killer wrote on the car door of victim Bryan Hartnell "by knife". On November 8th 1969, he claimed his involvement in the Snoozy-Furlong murders by the addition of "Aug" on the 'Dripping Pen' greeting card, followed by the November 21st 1969 San Jose letter possibly suggesting that Reet Jurvetson was another one of his knife victims. Then came the "Bleeding Knife of Zodiac" mailed from Fairfield on December 16th 1969, followed by the 'Melvin Belli' letter on December 20th 1969, stating he was losing control and looking for victims nine and ten.  

On April 20th 1970 he was claiming a victim count of ten - so if we are to determine the murder victims or proclaimed murder victims of the Zodiac Killer, then we must take all of the above into account. Based on three of the four attacks to date, victims nine and ten may have been a couple. They would have been murdered between December 20th 1969 and April 20th 1970, in a non-sexual attack that involved numerous knife wounds. It is also critical (whether the Zodiac Killer was responsible or claiming to be the responsible) that they would would be found close to Interstate 80 or U.S. Route 101.
​
On February 22nd 1970, John Franklin Hood (24), who had served decorated time in Vietnam in the 64th Armoured Division and Sandra Garcia (20), who worked in the California Department of Motor Vehicles, were discovered brutally stabbed on a beach close to Santa Barbara Cemetery and East Cabrillo Boulevard. This crime in some ways mirrored the stabbings at Lake Berryessa on September 27th 1969, with Sandra Garcia receiving the brunt of the vicious attack. The beach where their bodies were found, lies only 500 meters from U.S. Route 101. The mental map of the Zodiac Killer is starting to take shape.

The Zodiac Killer may have been inspired to switch from gun to knife after the extensive front page coverage given to the murders of Debra Gaye Furlong (14) and Kathy Ann Snoozy (15), who were found murdered on August 3rd 1969 in the Bay Area of San Jose. They were savagely attacked with a penknife. The chief medical examiner described the ferocity of the attack: "Dr. Hauser, so shaken by the brutality of the crime he could scarcely find words, said the Snoozy youngster had 150 wounds on her back, 50 on the front and a "storm" of punctures on her neck. Deborah's body had about 100 wounds on her back and upper front and a dozen on her neck". Disillusioned by his lack of front page coverage, the Zodiac Killer struck in Lake Berryessa on September 27th 1969 inflicting 16 knife wounds on the defenseless Bryan Hartnell and Cecelia Shepard. He would write on the card door of Bryan Hartnell's vehicle minutes after the attack, stating Vallejo 12-20-68, 7-4-69, Sept 27-69 -6:30 by knife. On November 8th 1969 he would not only claim the murder of Cecelia Shepard, but the murders of Debra Furlong and Kathy Snoozy in the August of 1969, writing Des, July, Aug, Sept, Oct = 7 on the greeting card. 

Just thirteen days after the mailing of the 'Dripping Pen' greeting card, the Zodiac Killer would write another cryptic message on November 21st 1969 - this time to the San Jose Police Department (the city of the Snoozy and Furlong murders), bumping up his running victim total to November = 8 and beginning the message with "There's no doubt I will do my Thing!". Bearing in mind the Zodiac Killer had switched to a knife at Lake Berryessa to achieve "front page coverage", and claimed the savage knife murders of two teenage girls, who had both been stabbed in excess of 100 times, the Zodiac Killer's claimed 8th victim should mirror these attacks. If he was going to keep up the terror in the minds of the American people, the 8th victim would likely have been murdered in California just prior to the mailing of the November 21st 1969 letter - and stabbed multiple times. 

Although unidentified until 2016 and known only as Jane Doe 59, Reet Jurvetson (19) was discovered on November 16th 1969 by Trevor Santochi, who was hiking on Mulholland Drive in Los Angeles. Reet Jurvetson had been viciously stabbed in excess of 150 times by a common penknife in the neck, chest and torso, similar to the attack on the two teenage girls from San Jose. Close to her body in the ravine next to the road, a pair of black prescription glasses (Liberty brand frames) were discovered. Detectives have concluded they are likely connected to her death. The Zodiac Killer was extremely unlikely to have been responsible for her murder, but just like the vague clue of "Aug" on November 8th 1969 insinuating his involvement in the penknife attack on Snoozy and Furlong, was he similarly giving us the vague clue of November = 8 to suggest his involvement in another senseless penknife attack just five days earlier? Had he read about the discovery of Reet Jurvetson's murder in the newspapers - the similarities between the two crimes of which would not have gone unnoticed.   

On October 20th 1969, nine days after the murder of Paul Stine in Presidio Heights, somebody made a threatening phone call to the Palo Alto Times newspaper saying he intended "to pick the kids off as they get on the school bus". The San Bernardino County Sun reported on the threat, stating "Patrol cars convoyed school buses around Palo Alto yesterday after a telephoned murder threat by a man claiming to be the Zodiac Killer of five persons. The weird slayer who signs himself "The Zodiac" made a similar threat in a letter to the San Francisco Chronicle last week after the Oct 11 shooting of a taxi driver. The district transportation supervisor said an armed guard might ride with each of the system's 25 buses. Officers in Napa and Vallejo, areas of the first three murderous attacks, some 45 miles north of Palo Alto, have been convoying police officers. Palo Alto Police Chief William Hydie called the new threat "extremely serious," but warned against over reaction to what might be a crank call".

On November 8th 1969, the Zodiac Killer mailed the 'Dripping Pen' card and 340 cipher to the San Francisco Chronicle claiming the "Aug" murders of Debra Gaye Furlong (14) and Kathy Ann Snoozy (15), who were found brutally stabbed on August 3rd 1969 in the Bay Area of San Jose.

On November 21st 1969, somebody claiming to be the Zodiac Killer wrote to the San Jose Police Department​ threatening the life of a widow, accompanied by the words "There's no doubt I will do my Thing". The brief text in the letter clearly contained enough information for police to identify the woman and implement 24-hour surveillance on her residence.

On December 7th 1969, a letter was mailed from Fairfield stating "I just need help. I will kill again, so expect it any time the will be a cop".

On December 16th 1969, another letter arrived from Fairfield threatening to kill "government life" and "cops" in Sacramento, Fairfield, Napa, Vallejo, Oakland, San Francisco and San Jose. A future geographic profiling technique was applied to the locations in which he 'threatened murder' (as detailed in the Fairfield letter), and noted that "Interstate 80 begins at an interchange with U.S. Route 101 (US 101) in San Francisco, and then crosses the San Francisco–Oakland Bay Bridge into Oakland. It then heads northeast through Vallejo, Fairfield, Sacramento, and the Sierra Nevada mountains before crossing into Nevada". The idea was to identify the areas the Zodiac Killer was prepared to target, based on their accessibility to him using a main commuter route he regularly traveled. If he regularly used the I-80 for his profession, then six of these seven destinations are directly passed by the I-80, with Napa only a few miles off route.

On December 19th 1969, somebody claiming to be the Zodiac Killer again threatened cops, making a phone call to Sergeant Robert Rengsdorff of the San Jose Highway Patrol (see article above), stating "I am going to kill five of you officers and a family of five between now and Monday". This threat towards San Jose police and a family of five was issued on a Friday, exactly as was the November 21st 1969 letter, mailed to San Jose police threatening harm on a widow. After the threat on the widow was thwarted by 24-hour police surveillance on her residence, was this the response, to once again instigate fear in the San Jose community? Were the widow and 'family of five' of the same residence? We know he was threatening the lives of numerous police officers, but the threat on five members of a family appears rather specific.           

On December 20th 1969, the Zodiac Killer mailed the 'Melvin Belli' letter containing a piece of murdered Paul Stine's shirt, effectively proving the author was the murderer of the taxicab driver on October 11th 1969. This letter mimicked the December 7th 1969 Fairfield letter by stating "please help me", which in some way helps to authenticate both Fairfield letters not released to the newspapers.

​The purpose of this article is to show the targeted areas of the Zodiac Killer (if responsible for these letters and phone calls) from the standpoint of geographic profiling. These events spanned from the October 11th 1969 murder of Paul Stine, to the mailing of the 'Melvin Belli' letter on December 20th 1969 (71 days). The areas shown in red above, highlight the locations the Zodiac Killer targeted by murder, proposed murder, as well as by his threatening phone calls and letters - and they are all connected by one direct route of travel.

During these 71 days in October, November and December the Zodiac Killer focused his attention on Sacramento, Fairfield, Vallejo, Oakland, San Francisco, Palo Alto and San Jose. Interstate 80 and U.S. Route 101 provide one seamless journey from Sacramento to San Jose. Was the Zodiac Killer a traveling salesman which took him through each of these locations - and therefore he had a familiarity with? Do these commuter route tell you anything about his home residence during this time period? 
When you commit, or intend to commit these acts, accessibility to and from a main commuter route could be invaluable.

Equidistant (as the crow flies) to Sacramento and San Jose is the waterfront city of Vallejo, believed by many to be the home residence of the Zodiac Killer. It is 53 miles from Sacramento and 57 miles from San Jose. The Springs and Tuolumne payphone, where Zodiac placed a call to police dispatcher Nancy Slover on the morning of July 5th 1969, sits 728 metres from Interstate 80.

Most, if not all Zodiac forums and websites classify the January 29th 1974 Exorcist letter as confirmed Zodiac correspondence. It is widely touted by law enforcement, newspapers and documentaries as the last confirmed Zodiac communication, and in a poll conducted on this site, 86% of visitors believe it to be genuine Zodiac material. This mailing was listed in the 2000 San Francisco 'Suspected Zodiac Correspondence' DNA Report as one of the communications processed for DNA. The subsequent 1974 letters were not processed for DNA, otherwise the report would have stated this. Since the Exorcist letter was widely considered to be the last confirmed Zodiac communication, it would therefore make perfect sense that this took priority over the Citizen Card and Red Phantom letter to be the only 1974 correspondence tested.

Mike Rodelli wrote in his book, 'The Hunt for Zodiac:The Inconceivable Double Life of a Notorious Serial Killer', that Alan Keel, Criminalist at the San Francisco Police Department, San Francisco, California from 1996 to 1999 "revealed that there were two letters in possession of the department that, in contrast to the "true" Zodiac letters, had abundant saliva and DNA-containing oral epithelial cells on them, that DNA was easily extracted from these two letters, and that the DNA extracted from these two letters matched between them. These two letters were considered forgeries, since the "true" Zodiac verifiable letters had not been licked by the sender." Mike Rodelli added that "In contrast (to earlier communications), Keel analyzed two other letters, one of which is the 1978 forgery, and finds that this letter and one of the 1974 letters are loaded with saliva and cells. He then easily extracts DNA from both of these letters using the more primitive DNA technology of that time and finds that the DNA matches between those two letters, thus proving that one person sent both."  

For two letters to have a definitive match of DNA they must have a complete profile. A partial DNA profile from one letter compared to a full DNA profile of the other could only be used to exclude them as having been licked by the same person, not conclusively tie them together as having a single contributor. Since the Exorcist letter appeared to be the only 1974 letter processed for DNA, it can be argued from Alan Keel's statement that the two letters that matched in DNA were the 1978 letter and Exorcist letter. If the San Francisco DNA report concluded that the 1978 letter was "not an authentic Zodiac letter", then there is a strong possibility that neither was the Exorcist letter.

For those who resolutely argue that the Exorcist letter is a genuine Zodiac communication, may have to accept the authenticity of the 1978 letter too. According to all the above observations, these two communications are inextricably linked by one sender. In early 2018 Vallejo police Detective Terry Poyser, who has worked the Zodiac case for four years, said his agency has submitted two envelopes (in late 2017) that contained letters from the Zodiac Killer for a type of advanced DNA analysis that previously had not been available in the case. Poyser declined to identify the lab, but said it would attempt to obtain a full DNA profile from saliva on the envelope flap and stamps. He said he expected to have results back from the lab as soon as in the next few weeks, and almost certainly by summer. Sacramento Bee.

Why are they attempting to find a full DNA profile, when presumably they have already achieved a full DNA profile, according to Alan Keel and the San Francisco Police Department DNA report? They cannot claim the 1978 letter as "not an authentic Zodiac letter" in a DNA report, unless a full profile exists. Furthermore, how did they ascertain the 1978 letter was not Zodiac, unless they knew who licked the envelope and stamp seal - and knew that person wasn't Zodiac. They couldn't ascertain the 1978 letter wasn't Zodiac by comparing it authenticated early Zodiac material, because seemingly these had not yielded a full DNA profile as we stand today. They clearly seem to have little faith in the Exorcist letter either, because if this has generated a full DNA profile in the past, but they are still "attempting to obtain a full DNA profile from saliva" today, then I presume this invalidates their confidence in its authenticity.  

Tom Voigt recently began a forum thread on the Zodiac Killer message board entitled Vallejo Police Department DNA Update, stating "The lab work has turned into more lab work. VPD is still at it. The hunt continues..." Why are they still hunting for viable DNA when apparently a full profile has been secured previously? Even if law enforcement have little confidence in the Exorcist and 1978 letter, these would have provided the best options to run through a genealogy website 18 months ago and the results would have been in by now had anything fruitful been generated. Unless of course, you already know who forged both of these letters. I see no benefit in not seeking profiles from these two letters (generated from the 1978 letter and another, if different to suggested) to enter into a familial DNA program. If the familial search threw out a notable family tree, or the lineage of a recognized Zodiac suspect, then it would add credence to the previously doubted Zodiac communication. 

For the 60% of people who voted on this site, believing the 1978 letter to be from the hand of the Zodiac Killer, the question you should be asking is, why did the the 2000 San Francisco DNA  Report determine the 1978 correspondence to be "not an authentic Zodiac letter" if they hadn't already obtained a full DNA profile to make such an authoritative and conclusive judgement? The only other reasonable conclusion, is that they already know who the author is.    ​

Bringing together several articles to paint the entire picture, I would like to tell you a little story about San Jose and the major impact it had on the actions of the Zodiac Killer spanning just over two years. The attack on Bryan Hartnell and Cecelia Shepard at Lake Berryessa on September 27th 1969, inextricably linked to Debra Gaye Furlong (14) and Kathy Ann Snoozy (15), two young girls who were found murdered on August 3rd 1969 in the Bay Area of San Jose. The man ultimately convicted for these two murders in 1971, Karl Francis Werner, was the trigger behind the attack at Lake Berryessa. 

The Zodiac Killer had successfully murdered three and seriously injured one person by the time he mailed his trinity of July 31st 1969 letters to the San Francisco Chronicle, San Francisco Examiner and Vallejo Times-Herald. He then presented codebreakers with the extremely unusual challenge of deciphering three parts of one cipher from the hand of a serial killer, demanding that he receive front page coverage for his efforts. The three communications and three murders, in his mind, warranted the full attention of the American public when he wrote "Here is part of a cipher the other 2 parts of this cipher are being mailed to the editors of the Vallejo Times and SF Examiner. I want you to print this cipher on the front page of your paper. In this cipher is my idenity. If you do not print this cipher by the afternoon of Fry.1st of Aug 69, I will go on a kill ram-Page Fry. night. I will cruse around all weekend killing lone people in the night then move on to kill again, until I end up with a dozen people over the weekend".  

The two major news publications, the San Francisco Chronicle and Examiner, dismissed his demands by only publishing his offerings on page four and nine respectively. The Zodiac Killer's disdain was immediate, when on August 4th 1969 he presented us with his sinister pseudonym "This is the Zodiac Speaking" in a follow-up letter, that concluded with "I was not happy to see that I did not get front page coverage". But imagine his horror, when two days later the San Francisco Chronicle (August 6th 1969) ran a comprehensive front page article about the murders of Debra Gaye Furlong and Kathy Ann Snoozy in San Jose. Here is an excerpt:

The two young girls, found dead Sunday on a sun-parched San Jose hillside, appear to have been victims of a sexual psychopath, whose blood frenzy led him to "overkill". Dr. John E. Hauser, Santa Clara county's chief medical examiner and coroner, said yesterday that the girls, Deborah Gay Furlong, 14, and Kathy Snoozy, 15, died in a "frenzied flurry of knife-wounds" inflicted so swiftly that neither gave any evidence of having struggled against the attack. Dr. Hauser, so shaken by the brutality of the crime he could scarcely find words, said the Snoozy youngster had 150 wounds on her back, 50 on the front and a "storm" of punctures on her neck. Deborah's body had about 100 wounds on her back and upper front and a dozen on her neck. Dr. Hauser said he was "puzzled" by many aspects of the brutal slaying. He said neither girl had been sexually molested; neither had suffered any wounds below her waist, neither gave evidence of having struggled to escape. Only the Snoozy girl, he said, had one small mark on her hand, suggesting she may have tried vainly to deflect the plunging knife. The coroner said both girls must have died very quickly and he is investigating the possibility they may have been drugged before the stabbing began. Blood and skin samples as well as stomach contents have been sent for further examination to area laboratories, he said. The results should be known in a few days. It is Dr. Hauser's opinion that the multiple puncture wounds were inflicted by one or two small knives, the largest wound the size of a pocket knife with a half-inch blade. "I've never seen a case with this many stab wounds," Dr. Hauser said. "You know, I've been in this profession a long time and sometimes I think I'm rather callous, but when I saw these girls, believe me it was terrifying. "The Nazi sex mutilations during World War II were nothing compared to what was done to these young girls.     

The Zodiac Killer must have been incensed that despite his brutal murder of three people during the holiday season, followed by his cryptic correspondences, he failed to achieve front page coverage from the Chronicle or the Examiner, despite threatening another dozen victims over the weekend. The only difference, he must have surmised, was the method of attack and the horror that such an intimate attack with a bladed instrument on two young girls had engendered in the psyche of the newspapers and public at large. The Zodiac Killer knew at this moment he had to ratchet up his attacks and get up close and personal with the use of a knife. But this wouldn't be any ordinary attack - he would dress up in an executioner's costume and hunt for young girls armed with a 12-inch knife - not "a pocket knife with a half-inch blade". Although Karl Francis Werner's capture was two years in the making, he was the absent agent behind the attack on Bryan Hartnell and murder of Cecelia Shepard just seven weeks later. Without the murders of Debra Gaye Furlong and Kathy Ann Snoozy on August 3rd 1969, it can be argued the attack at Lake Berryessa would never have taken place.

No surprise then, that the Zodiac Killer wanted to outdo the August 3rd 1969 murders, by setting his sights on three young girls from Pacific Union College as they sunbathed on the shores of Lake Berryessa on September 27th 1969. Three murders with a 12-inch bladed knife would definitely have done the trick. But something clearly thwarted this attack and two hours later he focused in on Bryan Hartnell and Cecelia Shepard, determined not to be denied and secure his front page coverage. After the sixteen strikes into the young couple, he retreated and traveled back up the hill to lay claim to this attack as the Zodiac Killer. After writing the dates of his previous two attacks and this one on the car door of Bryan Hartnell, he emphasized the words "by knife" at the foot of the message. The Zodiac Killer was effectively saying "do I get front page coverage now". The brutal knife attack, he hoped, would get the recognition akin to the murders of Kathy Snoozy and Deborah Furlong. Not only did he get the recognition, but it had an added benefit of the newspapers considering the possibility of his involvement in the Kathy Snoozy and Deborah Furlong murders. This certainly didn't escape his attention.    

Six weeks later he duly obliged by slipping in "Aug" into his confirmed murder count when mailing the 'Dripping Pen card on November 8th 1969, bumping up his total to seven victims. The Lake Berryessa attack "by knife" had effectively secured him two more victims by association. But to cement his perceived involvement in the San Jose murders, he had to strike while the iron was hot.

On November 21st 1969 he mailed a threatening letter to the San Jose Police Department beginning with the words "There's no doubt I will do my Thing!". The letter initiated this response: 'For the information of the Bureau and Sacramento, after a cursory analysis, officers of the San Jose, California PD, believe widow in message may be Mrs (redacted), San Jose, California. San Jose PD instituting 24 hour surveillance on Mrs (redacted).' It is clear that this woman had some connection to the Snoozy and Furlong murders, and by the Zodiac Killer interjecting himself into the San Jose investigation, he was attempting to solidify the notion of his involvement in them. Bearing in mind this letter was mailed to the San Jose Police Department and their response to secure the woman's safety, it isn't too surprising that the Zodiac Killer would threaten to murder a San Jose policeman in the Fairfield letter mailed a month later, on December 16th 1969. The Zodiac Killer thought he had now successfully cemented his claim to the Snoozy and Furlong murders. His choice of switching from gun to knife had paid dividends. My guess, is he was banking on these murders never being solved.

Imagine the Zodiac Killer's dismay in late April of 1971, when his plans lay in tatters, upon the arrest of Karl Francis Werner for the April 11th 1971 murder of Kathy Bilek at Villa Montalvo in Saratoga, as well as the murders of Kathy Snoozy and Deborah Furlong in San Jose two years earlier, on August 3rd 1969. The Zodiac Killer would eventually be exposed as a fraud - caught in the act of claiming somebody else's victims at last. He reacted forthwith, by mailing two communications to the San Francisco Chronicle in the middle of 1971. 

In the first, he was trying vainly to convince us that he was in fact the murderer of all three girls (Snoozy, Furlong and Bilek) by claiming that Karl Francis Werner was the fraud or phony. Paul Avery, arch nemesis of Zodiac, wrote an article on April 30th 1971 detailing the capture of Werner. The newspaper article stated "He (Werner) was immediately advised of his rights concerning any statements he may make and legal representation to which he is entitled, the detectives said. Werner was then taken to the scenes of the crimes. Late yesterday he was undergoing questioning. The detectives would not reveal what statements, if any, he had made concerning the killings of the three girls". 

The Zodiac Killer responded sometime after he read this article (around May, June or July of 1971), mailing a 148 character cipher stating "Tis the Zodiac Speacking. Why can't you stop me. I can't stop killing. Stop listening t(o) phonys. If this is not on your front page in a week I will skin 3 little kids and make a suit from the skin". In this correspondence he claimed his victim count was 21, by writing "I done it 21 times". This, in accordance with his claimed victim count of 17+ in the March 13th 1971 'Los Angeles' letter. We can ascertain that this communication was mailed around the middle of 1971, because he fired off a second correspondence at about the same time. The correspondence about to be discussed was withheld from newspaper publication (as was the 148 character cipher), so the fact that both contained a victim count of 21 and mailed in close proximity to one another, should be enough to consider both being mailed by the Zodiac Killer. The second communication we will show, is not only trying to claim the murder of Kathy Bilek - again attempting to show that Karl Francis Werner was a phony - but is also linking itself to the murders of Snoozy and Furlong.    

On July 13th 1971 a pasted card was mailed to the San Francisco Chronicle with the words "Near Monticello Shought Victims 21 ...... In The Woods Dies April". Many have speculated on the location mentioned in the card as "Monticello" in Napa County, California, because of the Lake Berryessa attack on Bryan Hartnell and Cecelia Shepard on September 27th 1969. It has been further speculated on whether "April" was a woman's name or the month of the alleged murder. After a comprehensive review of all the information, I believe the woman's identity, labelled as victim number 21, can finally be revealed, along with the exact location of Monticello. 

On Sunday, April 11th 1971, Kathy Bilek (18) visited Villa Montalvo in Saratoga, having planned to read a paperback book (The Gabriel Hounds) and engage in a spot of bird watching​ in the seclusion of a remote, wooded portion of the park, near a small stream. Her body was found the next day by her father, Charles, while Santa Clara County Sheriff's deputies searched nearby. She had been stabbed 17 times in the back and 32 times in her chest and stomach, although her killer had taken care to avoid stabbing her breasts. Her murder was also attributed to Karl Francis Werner. Wikipedia. The brutal murder of Kathy Bilek would again be claimed by 'Zodiac', not only in the Monticello card, but in another alleged Zodiac letter, also mailed to the San Francisco Chronicle at about the same time as the Monticello card. Kathy Bilek was murdered in "April", exactly as mentioned in the Monticello card, and "in the woods" at Villa Montalvo (a wooded section of the park). Saratoga is a city in Santa Clara County, California, United States. It is located on the west side of the Santa Clara Valley, directly west of San Jose, The appearance of San Jose once again. ​ ​

It was easy to get sidelined into believing Monticello was referring to Napa County, because the town was completely covered by Lake Berryessa, the site of Zodiac's third attack. However, the "Monticello" the author is referring to in the pasted card, is again in San Jose. Monticello is a neighborhood in San Jose, California, just over 9 miles east of Villa Montalvo, the site of Kathy Bilek's murder. ​In other words, the author of the card was saying "I killed Kathy Bilek near Monticello, in the Villa Montalvo woods in April". ​To view the proximity of Monticello to Villa Montalvo click here.

The Monticello card stated "Shought victims 21", referring to the Kathy Bilek murder, whereas, in the 148 character cipher, the author was claiming he had already "done it 21 times." The Monticello card was never released to the newspapers or public, so bearing in mind these two communications were both likely mailed at approximately the same time, there is a high probability they were mailed by the Zodiac Killer.

"I killed Kathy Bilek near Monticello, in the Villa Montalvo woods in April".
"Near Monticello Shought Victims 21 ...... In The Woods Dies April".

The ​November 8th 1969 'Dripping Pen' card would not be the only communication insinuating his involvement in the murder of Deborah Gaye Furlong and Kathy Ann Snoozy, when the Monticello card arrived just over 20 months later, on July 13th 1971. The San Francisco Police Department had reason enough to place the Monticello card in 'suspected Zodiac correspondence' when searching for traces of DNA on potential Zodiac communications, indicating the high regard it was held in.

It is with little doubt that Karl Francis Werner was responsible for the murder of Deborah Furlong, Kathy Snoozy and Kathy Bilek in 1969 and 1971, but the overarching question is, why did the Zodiac Killer describe the location of Kathy Bilek's body as "near Monticello"? The neighborhood of Monticello is 9 miles east of Villa Montalvo. Why did the Zodiac Killer choose to pinpoint this particular location, rather than any other neighborhood in between Monticello and Villa Montalvo? He could have pasted "near Willow Glen", "near Oster", "near Carlton", or any other location closer than Monticello. It is arguable that he chose this particular location for a specific reason.   ​

Tom Voigt, creator of the hugely successful Zodiackiller.com website has sought a potential Zodiac letter, described as the DMV letter. On his message board he stated "While I don't yet have as many details as I would like, at some point the Zodiac wrote a letter to the chairman of the Department of Motor Vehicles (DMV) in California. The letter was authenticated, apparently via handwriting, and was kept quiet for reasons unknown". None of the following can be definitively proven, but I will attempt to expand on this elusive correspondence based on the limited information we have, and use the propensity of the Zodiac Killer to respond to newspaper and magazine articles against him. We know he closely followed anything that was written about him and often replied in kind. With that said, it is possible the DMV letter was mailed to the chairman of the Department of Motor Vehicles because he read an article referencing this department. If the letter was addressed to the chairman, it is very likely the letter was addressed to the headquarters of the DMV in Sacramento. What we now have to do, is tie the Sacramento DMV to a Zodiac crime, or a crime claimed by Zodiac, written in a publication that the Zodiac Killer had reason to read - who subsequently got upset because it portrayed him as a liar and a fraud. It therefore follows, that it is highly unlikely to be a polite correspondence from the Bay Area killer. Based on the above, I believe the DMV letter was mailed in the October or November of 1971.

As early as November 8th 1969 the Zodiac Killer was claiming the murders Deborah Gaye Furlong (14) and Kathy Ann Snoozy (15), who were found murdered on August 3rd 1969 in the Bay Area of San Jose. This was his "Aug" on the 'Dripping Pen' card. He would later insinuate his involvement in the murder of Kathy Bilek (18), murdered in the woods of Villa Montalvo in Saratoga, due west of San Jose. On July 13th 1971, a potential Zodiac communication arrived in the form of a pasted card. It read "Near Monticello Shought Victims 21 ...... In The Woods Dies April". The author of the card was detailing the murder of Kathy Bilek in the woods of Villa Montalvo on April 11th 1971, just 9 miles from the neighborhood of Monticello in San Jose. He chose this neighborhood because it sat adjacent to Oak Hill Memorial Park at 300 Curtner Avenue. The cemetery where the body of Kathy Ann Snoozy lay - and chosen to hint at the forename "Kathy", pertaining to Kathy Bilek.

​Assuming these communications were mailed by the Bay Area murderer, it would be fairly obvious that the Zodiac Killer was following the San Jose murders closely from August 3rd 1969, through his 'Dripping Pen' card of November 8th, to the eventual murder of Kathy Bilek, and up to his correspondences in the middle of 1971. Therefore, it would be no great surprise if he continued to monitor any newspaper or magazine articles regarding the murders of the three young females. ​

In October 1971, a magazine publication entitled 'True Detective' comprehensively featured the murders of Kathy Snoozy, Deborah Furlong and Kathy Bilek, and the subsequent arrest of Karl Francis Werner. There is every chance the Zodiac Killer read this magazine article, compelling him to continue his contact with authorities regarding these murders.

One particular section about Kathy Bilek caught my eye - that may have been the reason why the Zodiac Killer wrote a letter to the chairman of the DMV in Sacramento. It stated "At about the same moment, Park Ranger Ken Williamson was informing a member of the investigative team that he, too, had noticed a tall, bespectacled young man who had been a frequent visitor at Villa Montalvo. He was a loner and had impressed the Villa's ranger staff with his almost furtive conduct, said Williamson. The ranger had jotted down the license number of the strange youth's auto.
The license number was forwarded to the California Department of Motor Vehicles headquarters in Sacramento, the state's capital 150 miles to the north of San Jose. The information teletyped back from the registration bureau was that the auto was the property of a Karl Francis Werner, living at an address on Shawnee Lane in San Jose." 

The Zodiac Killer, having previously mailed two communications (Monticello card and 148 character cipher) referencing the murder of Kathy Bilek and the victim total of 21, it wouldn't be at all surprising if he fired off a third communication, this time to the Department of Motor Vehicles in Sacramento, after reading these two paragraphs. As this magazine article was published in October of 1971, the DMV letter may have been postmarked with the latter months of that year - possibly October, November or December. The compunction of the Zodiac Killer in claiming, or interjecting himself into the middle of these murders, may have been the driver behind his contact with the chairman of the DMV. The content of this communication is unknown, but I guess he is continuing the menacing theme of his previous two correspondences, suggesting the identification of the vehicle belonging to Karl Francis Werner is somehow another red herring and threatening more murder and mayhem.

In a previous article we explored the concept of geographic profiling with respect to the Zodiac Killer, using search cost percentages to highlight the possible home location of the Bay Area murderer. Therefore, I thought it appropriate to look at the geographic profiling prediction applied to an already convicted serial killer, that of Dennis Rader (BTK). Some people have actually touted Dennis Rader as the infamous Zodiac Killer because of their propensity for writing poems, making phone calls and mailing letters to the newspapers and radio stations. So this geographic profile is more pertinent to the advocates of Dennis Rader as the cryptic killer.

Dennis Rader was responsible for 10 murders and 7 attacks from 1974 to 1991, that included in chronological order the Otero family, Kathryn Bright, Shirley Vian, Nancy Fox, Marine Hedge, Vicki Wegerle and Dolores E. Davis. He was eventually arrested near his home in Park City, Wichita on February 25th 2005. Below I have placed his murders on a map of Wichita and highlighted his home residence and the Christ Lutheran Church where he was president of the church council. The distances on the map show that he never ventured more than 9 miles from his home residence, and for the most part (except for two of his last three murders) gave himself a buffer zone of at least 6.27 miles for five of his attacks. The murders of Marine Hedge and Dolores E. Davis much closer to his home residence. The hot zone, represented by a search cost of 0% is shown by the large red dot on the map. This hot zone, predicted as where Dennis Rader most likely lived, was in the College Hill District of Wichita, exactly 7.50 miles from his home residence at 6220 Independence Street, Park City (subsequently bulldozed). His residence had a search cost of about 15% on a scale of 0 to 100%. So this would be described as a fairly warm zone.

Suspects are ranked based on their search cost—the percentage of the map searched before reaching the suspect’s anchor point. The search is conducted from the highest point of probability to the lowest; therefore, the lower the search cost, the more viable the suspect. If the geographic profile is accurate, the offender will have a low search cost. In the case of search cost, “map” refers to only the portion of the profile containing the crime scenes. As a result, suspects can have a search cost greater than 100%, which means a space larger than the area containing the crime scenes would have to be searched before reaching their anchor point. link. Here is a link to the Dennis Rader geoprofile using the Kim Rossmo model. geographicprofile.com. 

It has been stated that a serial killer will often commit his first murders in his comfort zone, implementing a buffer zone between the sites of his attacks and his home residence. In the case of Dennis Rader, his first two attacks were that of the Otero family and Kathryn Bright, 7.43 miles and 6.27 miles from his home residence. All but two of Dennis Rader's murders were perpetrated on a weekday. The Otero family were murdered on a Tuesday and Kathryn Bright was murdered on a Thursday - which is extremely relevant to the Zodiac Killer's first two attacks at Lake Herman Road and Blue Rock Springs Park, both perpetrated on a Friday. If Dennis Rader and the Zodiac Killer had worked that day, you have to consider the time constraints and expect the murders to be closer to their residence compared to a weekend, when they have greater freedom to travel.

So, if the Zodiac lived in one of the hot zones just east of American Canyon, let us compare the distances Zodiac would have traveled to his first two attack sites. As the crow flies, Lake Herman Road is 8.00 miles from American Canyon, wheres Blue Rock Springs Park is 4.77 miles. Compare this to the 7.43 miles and 6.27 miles traveled by Dennis Rader for his first two attacks. In total (both attacks) Dennis Rader traveled 13.70 miles. If the Zodiac Killer lived in American Canyon, he would have traveled a total of 12.77 miles (a difference of just 0.93 miles). The Zodiac Killer and Dennis Rader both sought the attention of the newspapers and media, but can both be compared using the Rigel software system of geographic profiling?       

The Bay Area murderer mailed three communications in total to the San Francisco Chronicle, San Francisco Examiner and Vallejo Times-Herald on July 31st 1969, demanding that his ciphers be printed on the front page of the respective newspapers by Friday afternoon (August 1st). This is what he wrote to each newspaper after stating several facts about his crimes.

Vallejo Times-Herald - Here is a cyipher or that is part of one. the other 2 parts have been mailed to the S.F. Examiner + the S.F. Chronicle I want you to print this cipher on your frunt page by Fry Afternoon Aug 1-69, If you do not do this I will go on a kill ram page Fry night that will last the whole week end. I will cruse around and pick of all stray people or coupples that are alone then move on to kill some more untill I have killed over a dozen people.

San Francisco Examiner - Here is a cipher or that is part of one. The other 2 parts are being mailed to the Vallejo Times + S.F. Chronicle I want you to print this cipher on the frunt page by Fry afternoon Aug 1-69. If you do not print this cipher, I will go on a kill rampage Fry night. This will last the whole weekend, I will cruse around killing people who are alone at night untill Sun Night or un till I kill a dozen people.

San Francisco Chronicle - Here is part of a cipher the other 2 parts of this cipher are being mailed to the editors of the Vallejo Times and SF Examiner. I want you to print this cipher on the frunt page of your paper. In this cipher is my idenity. If you do not print this cipher by the afternoon of Fry.1st of Aug 69, I will go on a kill ram-Page Fry. night. I will cruse around all weekend killing lone people in the night then move on to kill again, until I end up with a dozen people over the weekend. 

In a previous article we examined the present and past tense usage in the three letters, along with the stamps applied to the envelope, to make the case for the Zodiac Killer being a Vallejo resident. The following will be nothing groundbreaking, but examines the phrases and grammar used by the author to paint a picture of the subject when considering his identity. The Zodiac Killer threatened chaos over the weekend if his codes were not published on the front page of the papers. Unfortunately for him, the main two publications refused to bow to his threats. On August 2nd 1969, the San Francisco Chronicle under the title Coded Clue in Murders placed one-third of his cipher on page 4, while the San Francisco Examiner under the banner Vallejo Mass Murder Threat Fails (despite publishing the entire cipher) relegated it to page 9 on August 3rd 1969. This lowly showing in the San Francisco Examiner clearly upset the Zodiac Killer the most, when he hurriedly delivered by hand the August 4th 1969 'Debut of Zodiac' letter to the Examiner, stating "I was not happy to see that I did not get front page coverage". Putting aside the December 16th 1969 'Fairfield' letter (which many dispute), he never wrote to the San Francisco Examiner again.  

In a recent article we discussed the topic of geographic profiling to narrow the search field for an offender's home residence. Equally, the wording used by the Zodiac Killer in his communications may also help pinpoint a location, or at the very least give us an insight into his comfort zone or movements. Target or Victim Backcloth is the model by which a murderer may select his victims. The Zodiac Killer (wherever he lived) would have selected his victims dependent upon availability and location, along with the constraints of time and the day of the week. For a serial killer committing his crimes in Vallejo, his knowledge of the Target Backcloth may govern the types of individual he chooses. This seemed evident in his choice of couples parked up in lonely areas on December 20th and July 4th.

His communications to the San Francisco Chronicle, San Francisco Examiner and Vallejo Times-Herald exemplified this knowledge of a Target Backcloth perfectly, when he only threatened to kill couples in his address to the Vallejo Times-Herald (or stray people). He knew exactly where to find them, despite the fact it was highly unlikely he would continue to kill in the same area again. The Zodiac Killer never used the word couples in his address to the San Francisco Chronicle and Examiner, suggesting that his knowledge of the Target Backcloth was less comprehensive and more uncertain in this city- and why at San Francisco he would target a lone taxicab driver rather than target the location, as he did at Lake Herman Road and Blue Rock Springs. As Kim Rossmo stated  "The San Francisco murder differs significantly from the Zodiac's other crimes. Up to this point he was hunting in locations that had a good probability of containing his desired victims. Target selection was a function of area, not of an individual. However, it is unlikely the Zodiac was successful in all his searches; serial killers typically engage in extensive hunting activities, and for every attack there are many unsuccessful search attempts. In San Francisco, however, the Zodiac controlled the situation through his selection of victim type. The need for such control could be indicative of the distance the Zodiac had to travel to the crime site. Criminals who travel longer distances to offend are less likely to use uncertain target selection techniques".  

The Zodiac Killer wrote of ​"killing lone people in the night" or "killing people who are alone at night" to the Chronicle and Examiner, which is exactly what he did just over two months later on October 11th 1969, when Paul Stine was brutally gunned down inside his taxicab at Presidio Heights. The target selection began with the individual not the location. He then directed Paul Stine to an area to facilitate his best chance of escape. A Target Backcloth requires knowledge of an area and will govern to some extent the victims chosen, as displayed by some serial killers who target sex workers.   

It was considered that if the Zodiac Killer lived in Vallejo, he likely had a 9-5, Monday to Friday profession, based upon the fact, that when constrained by time he murdered close to home on a Friday, but unconstrained (on his day off), he was able to venture further afield to San Francisco and Lake Berryessa. He admitted as much in all the July 31st 1969 communications.

"I will go on a kill ram-Page Fry. night. I will cruse around all weekend" and "I will cruse around killing people who are alone at night untill Sun Night". The Zodiac Killer may potentially be limited in searching for courting couples on weekdays, but certainly not for lone victims in San Francisco, Vallejo or elsewhere Yet he has specifically tied himself to murder within the parameters of Friday night to Sunday night in these letters, and therefore highly suggestive he is employed on a weekday basis. 

The Brentingham model of geographic profiling details an activity space where an individual lives, works and plays. The Zodiac Killer targeted the San Francisco Chronicle, San Francisco Examiner and Vallejo Times-Herald in his first communications to the newspapers, indicating that Vallejo and San Francisco were his primary sites of travel. He most likely lived and worked in both. The newspapers he chose and the location he lived, part of his mental map, exhibited to its fullest extent when he subconsciously used the present and past tense in his three July 31st 1969 letters 

The Zodiac Killer - A Vallejo Resident [Part 2]​   

With the search for the infamous Zodiac Killer through DNA looking ever more threadbare, one very much overlooked tool in locating our offender is the 'science' of geographic profiling pioneered by Canadian criminologist Kim Rossmo, who utilizes the software geo-profiling tool Rigel to analyze the likely home residence of the Zodiac Killer. Rigel uses an algorithm called criminal geographic targeting (CGT) to identify hot and cold zones on a map and give the areas that our killer may (or may not) likely reside. In the case of the Zodiac Killer, it would take into account such things as the murder sites, phone calls, commuter routes, and geographic profiling models such as buffer zone, comfort zone, least effort principle, mental map, target backcloth and distance decay function. As Kim Rossmo points out, this is an accompaniment to law enforcement to narrow the pool of suspects, but takes a back seat to powerful forensic evidence. However, with limited forensic evidence available from the Zodiac crimes, this appears our best bet to narrow down the home location of our killer before venturing outwards. Searching for suspects the length and breadth of California is a thankless task, with many researchers identifying a potential suspect and ultimately layering weak circumstantial evidence upon weak circumstantial evidence, until they become convinced the totality of the evidence should now be reclassified as powerful and irrefutable proof of their suspect's guilt. There is a tendency to fit the suspect around the evidence, rather than let the evidence be the driver. 

Kim Rossmo stated: ​​"The San Francisco murder differs significantly from the Zodiac's other crimes. Up to this point he was hunting in locations that had a good probability of containing his desired victims. Target selection was a function of area, not of an individual. However, it is unlikely the Zodiac was successful in all his searches; serial killers typically engage in extensive hunting activities, and for every attack there are many unsuccessful search attempts. In San Francisco, however, the Zodiac controlled the situation through his selection of victim type. The need for such control could be indicative of the distance the Zodiac had to travel to the crime site. Criminals who travel longer distances to offend are less likely to use uncertain target selection techniques. In respect to the killer's home residence, he continued "There's a number of possibilities. But remember, Rancho Vallejo was possibly 26,000 people at that time, of which only 13,000 will be male, and only a certain proportion of those are of the correct age, and a certain portion of those are only going to be white. Then we start looking at the neighborhoods involved, we have a pretty small subset. Then we start combining that with some of the personal and behavioral descriptors, and then we work in the vehicle information. If this case was active today, it would not be too difficult to find this person." 

There is an excellent interactive online tool that has generated geo-profiling heat maps for killers such as Jack the Ripper, Dennis Rader (BTK), Atlanta Child Murders, Golden State Killer, Night Stalker, Yorkshire Ripper, Long Island Serial Killer and more. It can be found here at geographicprofiler.com. The Kim Rossmo heat map for the Zodiac Killer is located here. 
You can toggle the geoprofile using the sidebar to remove the heat map and identify the locations underneath the color. The red color is the most likely residence of the Zodiac Killer, with a graded scale to the least likely areas of purple and beyond. This is classified as a percentage search cost (link) - Suspects are ranked based on their search cost—the percentage of the map searched before reaching the suspect’s anchor point. The search is conducted from the highest point of probability to the lowest; therefore, the lower the search cost, the more viable the suspect. If the geographic profile is accurate, the offender will have a low search cost. In the case of search cost, “map” refers to only the portion of the profile containing the crime scenes. As a result, suspects can have a search cost greater than 100%, which means a space larger than the area containing the crime scenes would have to be searched before reaching their anchor point.

One can see that the search cost is lowest for the area just east of the Napa Junction, the area of Ridgeview Park, Mare Island Naval Shipyard and across the Carquinez Strait Bridge to the area of Crockett Hills (just east of Rodeo). The area I favor, around the Springs and Tuolumne payphone, is afforded a 4% search cost. Despite the majority of the Zodiac mailings originating from San Francisco, this area features low on the geo-profiling heat map, and backed up by the statements of Kim Rossmo above. He states that "geographic profiling can't solve a crime; there are only three ways to do that - eyewitness, confession or physical evidence - the role of geographical profiling is to allow a detective to get to that stage, where he or she can apply one of those techniques sooner, faster, more effectively and more efficiently". 

This means we target the red hot zones first, before extending outwards to orange, yellow, green, blue etc.The hot zones will inevitably sometimes fall over an unpopulated area, so the areas around them become the focus of our search. The technique of geographic profiling is a supportive tool to narrow the suspect pool and search parameters, especially in a case over 50 years old with limited physical evidence - narrowing the search field in order to prioritize our efforts. The possible candidates for the Zodiac Killer can be massively whittled down, as shown in the case of Rancho Vallejo, highlighted by Kim Rossmo above. After all, he did state "If this case was active today, it would not be too difficult to find this person."

The Symbionese Liberation Army enjoyed thumbing their nose at the FBI, law enforcement, Hearst Corporation and newspapers, in a general attack on the capitalist society they believed harmed the everyday lives of the American people. Their propensity for imitating Zodiac communications, I believe, just another avenue to obfuscate the investigation into the Zodiac murders and surreptitiously irritate any law enforcement agency. I have argued they were the agents in the design of at least three (if not all) of the 1974 communications widely attributed to Zodiac. Evidence in the form of documented Symbionese Liberation Army correspondence was used to discredit the February 3rd 1974 S.L.A letter, mailed to the Hearst family through the Burlingame, California, U.S. Postal Annex on February 10th 1974. For a full list of Symbionese Liberation Army articles visit here. It has been argued they were responsible for the Exorcist letter, S.L.A letter, Badlands card, Red Phantom letter, Albany letter and Channel Nine letter. In fact, none of the 1974 letters made any reference to the Zodiac Killer whatsoever and never utilized the infamous crossed-circle symbol.

On December 27th 1974, a Christmas card was mailed to Mary Pilker, Donna Lass' sister, portraying trees covered in snow. Once opened it revealed a message that was part of the card itself- 'Holiday Greetings and Best Wishes for a Happy New Year', followed by the handwriting "Best Wishes, St Donna & Guardian of the Pines". The envelope was addressed to Mrs Mary Pilker, 1609 South Grange, Sioux Falls, South Dakota. It was postmarked 940, either from San Mateo or Santa Clara County.

If my contention is correct, and the four purported Zodiac communications from 1974 were actually mailed by the Symbionese Liberation Army, then there is a reasonable argument to be made, that this is the fifth - and may explain the four year delay between the disappearance of Donna Lass from the Sahara Tahoe Casino and the mailing of this cryptic communication. The height of Symbionese Liberation Army activity was in 1974. 

We also have to question why this card was mailed from San Mateo or Santa Clara County to South Dakota rather than the Chronicle newspaper. It could be perceived as a sick ploy to upset the family of Donna Lass - although this could have just as easily been achieved by directing the correspondence through a newspaper outlet with greater publicity. After four years since the disappearance, one can't help thinking that the area the card was mailed to, had some significance regarding the Symbionese Liberation Army. The Symbionese Liberation Army targeted individuals in their communications, something the Zodiac Killer never did through his four confirmed canonical attacks. So let us take a look at three of the four alleged 1974 Zodiac correspondence to the San Francisco Chronicle.

Prior to the March 13th 1971 Los Angeles letter, every Zodiac communication was mailed from San Francisco. The January 29th 1974 Exorcist letter was postmarked 940 from either San Mateo County or Santa Clara County. The December 27th 1974 Mary Pilker Christmas card was postmarked 940 from either San Mateo County or Santa Clara County. William Peter Blatty, allegedly retired to a remote and rented chalet in woodland off Lake Tahoe, and wrote The Exorcist, a story about a twelve-year-old girl being possessed by a powerful demon. 

One possible author of the S.L.A letter (and possibly the Exorcist letter) was Sara Jane Olson (born Kathleen Ann Soliah on January 16, 1947). She was a member of the Symbionese Liberation Army in the 1970s. She grew up in Palmdale, California, the daughter of Norwegian-American parents, Elsie Soliah (née Engstrom) and Palmdale High School English teacher and coach Martin Soliah. Engström, Engstrøm and Engstrom are surnames of Swedish and Norwegian origin. Was she responsible for authoring the S.L.A letter on February 3rd 1974, one or two days before the kidnapping of Patricia Hearst? To examine this possibility we have to examine her background. The S.L.A letter was postmarked "U.S. Postal Service, CA 913 PM 3 FEB 1974". Kathleen Ann Soliah was brought up in Palmdale, Los Angeles County, California, often frequenting the nearby census-designated area of Agua Dulce. In fact, Agua Dulce was the commuter route from Palmdale to 1466 East 54th Street, Los Angeles -  the site of the deadly shootout between Symbionese Liberation Army members and law enforcement on May 17th 1974, resulting in the deaths of six urban militants. The Symbionese Liberation Army had its main headquarters in San Francisco and Los Angeles. Agua Dulce had a postal zip code of 91390, tying in nicely with the postmark on the February 3rd 1974 S.L.A letter. It is less than five miles from Palmdale. Kathleen Ann Soliah was brought up in Palmdale, California but was born in Fargo, North Dakota. This obviously borders the state of South Dakota (the address on the Christmas card), possibly giving us three links to Soliah through three 1974 communications. But this isn't the only link to South Dakota regarding the Symbionese Liberation Army. Something began in South Dakota in 1973 and continued through the mailing of the Mary Pilker Christmas card.  

Let us move on to the Badlands card, I have argued, was written by the Symbionese Liberation Army as an attack on the capitalist agenda and yellow journalism of the Hearst Corporation - and why Patricia Campbell Hearst was kidnapped in the first place. Here is the introduction of a two-part article outlining this concept. 

The Badlands card was postmarked Alameda County and mailed to the San Francisco Chronicle on May 8th 1974. It stated "Sirs -- I would like to expression myconsternt (crossed out) consternation concerning your poor taste + lack of sympathy for the public, as evidenced by your running of the ads for the movie "Badlands", featuring the blurb: "In 1959 most people were killing time. Kit + Holly were killing people." In light of recent events, this kind of murder-glorification can only be deplorable at best (not that glorification of violence was ever justifiable) why don't you show some concern for public sensibilities + cut the ad?  A citizen".

But why would the Symbionese Liberation Army choose this particular movie to highlight their consternation at the running of advertisements? Here is an excerpt from Wikipedia detailing the plot of the Badlands movie:

South Dakota; 1959. 15-year-old Holly Sargis is a teenage girl living in a dead-end town called Fort Dupree. She lives with her sign painter father, although their relationship has been strained since her mother died of pneumonia some years earlier. One day Holly meets a 25-year-old garbage collector named Kit Carruthers. Kit is a young, troubled greaser and Korean War veteran, who resembles James Dean, an actor Holly admires. Kit charms Holly, and she slowly falls in love with him. As Holly falls deeper in love for Kit, his violent and anti-social tendencies start to slowly reveal themselves. Holly's father disapproves of Holly and Kit's relationship, and shoots her dog as a punishment for spending time with him. Kit then comes to Holly's house and shoots her father dead. The couple fakes suicide by burning down the house and go on the run together, making their way towards the badlands of Montana.

The movie was based upon the real life events of Charles Raymond Starkweather (20) and his girlfriend Caril Ann Fugate (14). They were a pair of spree killers who embarked on a two month rampage, killing 10 people in total, including her entire family in the area of Nebraska and Wyoming back in 1958, before they were finally captured. ​Charles Raymond Starkweather was sentenced to death and executed in the electric chair at Nebraska State Penitentiary on June 25th 1959, while Caril Ann Fugate received a life sentence but was ultimately paroled after seventeen years,.in the June of 1976. Caril Ann Fugate lived in Lincoln, Nebraska, with her mother and stepfather. In 1956, at age 13, she formed a relationship with Charles Starkweather, a high school dropout five years her senior. However, the film was mentioned in the purported "Zodiac" card (not the real events), which featured an impressionable teenage girl from a dead-end town and her older greaser boyfriend, who embark on a killing spree in the South Dakota badlands. IMDB.

So, were the Symbionese Liberation Army responsible for the Mary Pilker Christmas card in the December of 1974, hinting at the Donna Lass disappearance through their connections to this area of Dakota? So far, there is only a weak connection through Kathleen Ann Soliah (possibly being the 1974 S.L.A author) and the South Dakota Badlands card. The Mary Pilker Christmas card used the almost spiritual or symbolic phrase of "Guardian of the Pines", as though somebody was protecting a region of Pine trees. So that is exactly what we will look for in the area of South Dakota, spanning the time period in question. But crucially, we must find a link to a Symbionese Liberation Army member who was effectively a "guardian of the Pines".

On November 6, 1973, in Oakland, California, two members of the SLA killed school superintendent Marcus Foster and badly wounded his deputy, Robert Blackburn, as the two men left an Oakland school board meeting. The hollow-point bullets used to kill Foster had been packed with cyanide. The SLA had condemned Foster for his plan to introduce identification cards into Oakland schools, calling him "fascist". In fact, Foster had opposed the use of identification cards in his schools, and his plan was a watered-down version of other similar proposals. On January 10, 1974, Joseph Remiro and Russell Little were arrested and charged with Foster's murder, and initially both men were convicted of murder. Both men received sentences of life imprisonment. Seven years later, on June 5, 1981, Little's conviction was overturned by the California Court of Appeal, and he was later acquitted in a retrial in Monterey County. Remiro remains incarcerated in San Quentin State Prison serving his life sentence. Wikipedia. Joseph Remiro's commitment to fighting the United States government led him to the Wounded Knee, South Dakota battleground on the Sioux reservation in April 1973. While there he assisted by running ammunition from bunker to bunker during firefights. He also became a member of Venceremos, a Maoist action oriented Bay Area organization which had a tremendous influence upon the future SLA. link.

We can now link a Symbionese Liberation Army member to South Dakota from April 1973 with a link to the word Sioux (both present on the Mary Pilker envelope). This however, is not enough on its own.  

The image on the right is seven-headed SLA hydra-like cobra symbol based on the seven principles of Kwanzaa, each head representing a principle. The Swahili words for these seven principles are: Umoja (unity), Kujichagulia (self-determination), Ujima (collective work and responsibility), Ujamaa (cooperative economics), Nia (purpose), Kuumba (creativity) and Imani (faith). The appearance of the symbol of the seven-headed cobra on SLA publications indicates that it was copied from the ancient Sri Lankan and Indian seven-headed nāga; carved stones depicting a seven-headed cobra are commonly found near the sluices of the ancient irrigation tanks in Sri Lanka and are believed to have been placed there as guardians of the water. The particular graphic of the seven-headed cobra used by the SLA may have been copied from an illustration in The Lost Continent of Mu by James Churchward. Wikipedia. Had the Symbionese Liberation Army shifted guardians of the water to guardian of the Pines?

Wounded Knee Creek is a tribunal of the White River, approximately 100 miles (160 km) long, in Oglala Lakota County, South Dakota in the United States. Its Lakota name is Čhaŋkpé Ópi Wakpála..The creek's name recalls an incident when an American sustained an injury to his knee during a fight. The creek rises in the southwestern corner of the Pine Ridge Indian Reservation, along the state line with Nebraska, and flows northwest. It borders the site of the 1890 Wounded Knee Massacre, in which the 7th US Cavalry under Colonel James W. Forsyth massacred approximately 300 Sioux, mostly women and children, many unarmed. Towns in this region include Wounded Knee and Manderson. The Wounded Knee Creek flows NNW across the reservation and joins the White south of Badlands National Park. But as already stated, the Wounded Knee incident began on February 27, 1973, when approximately 200 Oglala Lakota and followers of the American Indian Movement (AIM) seized and occupied the town of Wounded Knee, South Dakota, on the Pine Ridge Indian Reservation. The protest followed the failure of an effort of the Oglala Sioux Civil Rights Organization (OSCRO) to impeach tribal president Richard Wilson, whom they accused of corruption and abuse of opponents. Additionally, protesters criticized the United States government's failure to fulfill treaties with Native American people and demanded the reopening of treaty negotiations. Oglala and AIM activists controlled the town for 71 days while the United States Marshals Service, FBI agents, and other law enforcement agencies cordoned off the area. The activists chose the site of the 1890 Wounded Knee Massacre for its symbolic value. Wilson stayed in office and in 1974 was re-elected amid charges of intimidation, voter fraud, and other abuses. The rate of violence climbed on the reservation as conflict opened between political factions in the following three years; residents accused Wilson's private militia, Guardians of the Oglala Nation (GOONs), of much of it. More than 60 opponents of the tribal government died violently during those years, including Pedro Bissonette, director of the Oglala Sioux Civil Rights Organization (OSCRO). Wikipedia.

Leonard Peltier (born September 12, 1944) is a Native American activist and an enrolled member of the Turtle Mountain Chippewa, who is also of Lakota and Dakota descent. He is a member of the American Indian Movement (AIM). In 1977, he was convicted and sentenced to two consecutive terms of life imprisonment for first-degree murder in the shooting of two Federal Bureau of Investigation (FBI) agents during a 1975 conflict on the Pine Ridge Indian Reservation. In the early 1970s, he learned about the factional tensions at the Pine Ridge Indian Reservation in South Dakota between supporters of Richard Wilson, elected tribal chairman in 1972, and traditionalist members of the tribe. Consequently, Peltier became an official member of the American Indian Movement (AIM) in 1972. Wilson had created a private militia, known as the Guardians of the Oglala Nation (GOON), whose members were reputed to have attacked political opponents. Protests over a failed impeachment hearing of Wilson contributed to the AIM and Lakota armed takeover of Wounded Knee in February 1973, which resulted in a 71-day siege by federal forces, known as the Wounded Knee incident. In 1975, Peltier traveled to the Pine Ridge Indian Reservation as a member of AIM to try to help reduce the continuing violence among political opponents. Wikipedia.

The links are there to South Dakota, Sioux, Pines, guardians, Joseph Remiro and the Symbionese Liberation Army, but where is the connection to Donna Lass? We already have St. Donna, however, we don't have the surname Lass. Leonard Peltier is known in his native country of Great Turtle Island as Gwarth-ee-lass - "He Leads the People." Also known among his Sioux brethren as Tate Wikuwa - "Wind Chases the Sun." Also known as U.S. Prisoner #89637-132. Worldcat.org.  

Through the actions of Joseph Remiro, the author of the Mary Pilker Christmas card may have been alluding to the defense of Wounded Knee by a Symbionese Liberation Army member, from the "guardian of the Pine Ridge Indian Reservation" to the "guardian of the Pines" - and concealing lass within its obscure meaning. However, the connections made in this article are an example of the lengths we can go to in the Zodiac community to forge a link that in all likelihood doesn't exist.

It is a perfectly reasonable assumption that the biggest clue to the identity or inner mind of the Zodiac Killer should reside within the many communications he mailed over several years - the window to his soul if you like. He began his contact with the newspapers using three encoded messages on July 31st 1969, in part stating "when I die I will be reborn in paradise and all the (people) I have killed will become my slaves". The November 9th 1969 'Bus Bomb' letter continued this theme, promising to "change the way the collecting of slaves". The emphasis on paradice and slaves would continue through the July 26th 1970 'Little List' letter, the October 27th 1970 'Halloween' card and the March 13th 1971 'Los Angeles' letter. One could make the argument that this was designed to throw investigators off the scent, but one could equally make the case that the Zodiac Killer picked up the concept of victims becoming his slaves in the afterlife through personal experiences in his everyday life. The language we use and the words we speak are a product of the environment we live in. The 1960s and 1970s were a turbulent time in respect to race relations, with San Francisco no exception - and the Zodiac Killer having mailed the overwhelming majority of his communications from this location was not impervious to the society he operated in. As still exists in American society, the enmity between police and the black community has a long and well documented history.

Taking the Zodiac Killer as a product of his society, in tandem with the volatile racial tensions that permeated 1960s San Francisco and beyond, we will explore the "slaves in the afterlife" reference in the Zodiac communications from the angle of a racist connotation. Zodiac researcher Randall Scott Clemons, author of the website 'Zodiac Killer Enigma, Cracking the Zodiac Killer Code', contacted me regarding this topic - and the information he provided is the inspiration behind this article.

Entitled Spiritualism, Summerland, Slavery in the Afterlife by Emily Sosolik, this informative piece of writing showed the undeniable connection between religiosity and racism as a never ending bond of subservience. Here is a small extract: 
"No topic illustrated this dichotomy more than slavery. Much has been written about the egalitarian nature of Spiritualism, but the focus of the present piece is on Spiritualism in practice and how Spiritualists often used the movement to preserve the systemic racism of American society. When confronted with the overarching issue of slavery, Spiritualists used spirit messages to fashion a version of the afterlife called the Summerland which calmed their fears but perpetuated the subservient role of African Americans. And since Spiritualism’s focus was inward, on enlightenment of adherents, and upward on knowledge of the afterlife, the movement invariably distracted from acknowledging, understanding, and remedying the social inequality present on Earth". Zetojournal.com. 

Randall Scott Clemons was searching for a link between "slaves in the afterlife" and the Zodiac Killer, from the perspective of where this phrase originated in his mind, prior to putting pen the paper. In other words, the Zodiac Killer didn't just pluck this phrase out of thin air - his interaction within society shaped him as a person and possibly influenced his propensity to adopt this form of language within his communications. Randall Scott Clemons then found an extremely interesting book entitled Parental Discretion is Advised; The Rise of N.W.A and the Dawn of Gangsta Rap featuring a section on the brutal beating of Rodney King on March 3rd 1991 by Los Angeles Police Department officers, sparking riots in 1992 after the acquittal of three of the four defendants. The book made reference to phrases used by LAPD officers via computer transmissions in their patrol cars.    

Here is an extract from the book:
"Racial bias was rampant in the department, with an LAPD survey agreeing that prejudice on the part of officers towards citizens contributed to a negative interaction between police and the community, and that bias often led to use of excessive force. The report also showed how often incidents involving racial slurs from white officers against minority colleagues were frequently ignored. The culture of racism was so prevalent, officers were comfortable enough typing disparaging messages on computer transmissions between squad cars: "If you encounter these negroes, shoot first and ask questions later". "Sounds like monkey-slapping time". I'm back over here in the projects, pissing off the natives". "Everybody you kill in the line of duty becomes a slave in the afterlife". 

These phrases are not only deeply racial, they also do not exist in isolation of the time they were uttered - but have origins -often passed from one generation of police officers to another. This drives to the heart of the question - as to how long these 'police phrases' have been in existence and whether the Zodiac Killer may possibly have been involved in law enforcement prior or current to the murders in the Bay Area. Had the Zodiac Killer worked for the Los Angeles Police Department during this racially charged era in American history, picking up the phrase "Everybody you kill in the line of duty becomes a slave in the afterlife", and conveniently dropping the introduction to disguise his profession? As a law enforcement officer seeking victims in his spare time, access to copious seized weapons would be of little difficulty. 

Black slavery in America is well documented, and may shed new light on the design of the October 27th 1970 'Halloween' card, featuring four methods of execution commonly employed in the burning, lynching, shooting and stabbing of appropriated slaves. When we tie in the cross formation of paradise and slaves back into the equation, the inspiration and motivation of the Zodiac Killer in choosing this form of language may focus the eye in a whole new direction. The March 13th 1971 letter to the Los Angeles Times stated "If the Blue Meannies are evere going to catch me, they had best get off their fat asses + do something. Because the longer they fiddle + fart around, the more slaves I will collect for my after life". 

The admonishment of police by the Zodiac Killer and his adoption of the phrase "slaves in the afterlife" may indicate a history between the two - albeit one that likely didn't end on the best of terms.     

Eduard Versluijs brought to the attention of the Zodiac Killer Site forum a threatening letter directed toward Harland David Sanders,  best known for founding fast food chicken restaurant chain Kentucky Fried Chicken. He was titled 'Colonel' Sanders, although this was not an official rank, merely an honorary title. The envelope was addressed to Shelbyville, Kentucky. This letter was discussed with regards to the Zodiac Killer, but in actual fact it was almost certainly mailed by - you've guessed it - the Symbionese Liberation Army. The letter signed off with 'The General', which could be interpreted as a play on words, bearing in mind the 'Colonel' title of the recipient. However, it probably had more to do with the sender of the letter, or somebody sending it on his behalf. 

The SLA began as a collaboration between convicts and prison activists. Led by DeFreeze, an escaped convict and initially the only black member of the group, the seven other members, who were white middle-class men and women, adopted Swahili names and took up arms for the self-styled Symbionese Federation. The group’s motto, “Death to the fascist insect that preys upon the life of the people,” was included on each of their communiqués. The Symbionese Liberation Army were a small group of multiracial militant revolutionaries based in California during the 1970s that owes nearly all its notoriety to the kidnapping and subsequent indoctrination of Patty Hearst, the newspaper heiress. Founded in the Berkeley, California-area in 1973 by Donald DeFreeze, he was known to the group as General Field Marshal Cinque Mtume. This alone, would not be proof that the Symbionese Liberation Army mailed this communication, so we will dig a little further. 

Michael Morford unearthed a similar threatening letter mailed to Sammy Davis Jr in Las Vegas, Reno, Nevada, also signed off with 'The General'. There was an additional pink sheet of paper enclosed with a typewritten message beginning "Dec. 4, 1973..." and signed "Der Fuhrer". Both this and the Colonel Sanders threat were written on paper with the pre-printed address of Riverside Drive, Sherman Oaks, California, indicating they were almost certainly mailed by the same individual or group. 

The 'Colonel' Sanders threat was dated by the sender as January 14th 1974, and the Sammy Davis Jr threat was dated January 19th 1974. It is my contention that these two threats were probably mailed under the shortened pseudonym of General Field Marshal Cinque Mtume, aka Donald DeFreeze. The Symbionese Liberation Army were prolific letter writer's to the newspapers, radio and television stations, high profile individuals, along with the FBI and police. They used handwritten and typewritten communications - the latter of which is something the Zodiac Killer never did in any of his confirmed correspondence subsequent to July 30th 1969. These two threats were mailed to Shelbyville, Kentucky and Las Vegas, Nevada, and both were self-dated in January, 1974. So, you wouldn't be too surprised to hear that the Symbionese Liberation Army, led by a 'General', also mailed letters to Kentucky and Las Vegas in the same timeframe. 

Three letters from the Symbionese Liberation Army were mailed in February, 1974 to the 'Kentucky State Police in Henderson, Kentucky' (return address Henderson, Kentucky) and 'City Police Department, Berkeley, California' (return address Henderson, Kentucky). They also mailed a letter to the FBI in Las Vegas, Nevada on February 14th 1974. 'In early 1960s, the city of Las Vegas was growing rapidly, and the Bureau’s caseload there was rising right along with it. As a result, FBI Headquarters ordered the transfer of all cases and files pertaining to Nevada from the Salt Lake City Division to Las Vegas. In December 1960, John H. Williams was designated Special Agent in Charge and in February, 1961, the opening of the new division was announced. The new division was first housed in an office at 300 Fremont Street, but moved into a new federal building at 11th and Bridger Streets in May 1961'. FBI. In other words, the Symbionese Liberation Army were mailing to Kentucky and Las Vegas within one month of 'The General' mailing letters to 'Colonel' Sanders and Sammy Davis Jr, in Kentucky and Las Vegas respectively.  

The Symbionese Liberation Army appeared to target wealth (as they did with Randolph Hearst), in line with the seemingly anti-capitalist or anti-greed agenda they had built for themselves. Below are the four relevant envelopes mailed by the militant group, outlining their agenda.

In a series of recent articles it was shown that the February 3rd 1974 S.L.A. letter was mailed by the Symbionese Liberation Army, as likely were the other three 1974 communications purportedly mailed by the Zodiac Killer. The S.L.A. or Symbionese Liberation Army (SLA) were thrust into the spotlight after the kidnapping of Patty Hearst, a media heiress, on February 4th 1974. They were a short-lived urban militant group, operating from 1973 to 1975. The S.L.A. letter was mailed from Los Angeles County - the location  of a deadly shootout between Symbionese Liberation Army members and law enforcement on May 17th 1974 at 1466 East 54th Street, resulting in the deaths of six urban militants. The Symbionese Liberation Army had its main headquarters in San Francisco and Los Angeles. However, despite the militant group effectively fragmenting in 1975, not all members or allies of the group were apprehended. The group mailed numerous letters and cassette recordings to the newspapers, and to radio and television stations during the height of their operations. It is certainly conceivable that all the 1974 'Zodiac' letters were in fact written by the Symbionese Liberation Army, with the January 29th 1974 specifically designed to mimic previous Zodiac correspondence. The proof for this militant group's involvement in posing as the Zodiac Killer would come approximately four years later, when the Channel Nine letter was mailed to KHJ-TV in Los Angeles on May 2nd 1978. Arriving just one week after the April 24th 1978 "I am back with you" letter, widely considered a hoax, it may indicate the Symbionese Liberation Army's involvement in both 1978 letters. There was little motivation for the Zodiac Killer to reappear in 1978 and threaten [1] Daryl Gates [2] Edward Davis [3] Pat Boone, and [4] Eldridge Cleaver, all of which had no relevance to him whatsoever. But the Symbionese Liberation Army certainly had every reason to threaten numbers 1 & 2 on the list - Daryl Gates and Edward Davis.

Patricia Hearst was convicted in March 1976 and sentenced to seven years imprisonment. 'Hearst suffered a collapsed lung in prison (the beginning of a series of medical problems) and underwent emergency surgery, which prevented her from appearing to testify against the Harrises on eleven state charges including robbery, kidnapping, and assault; she was also arraigned for those charges. Hearst, who was being held in solitary confinement for security reasons, was granted bail for an appeal in November 1976, on condition she was protected on bond. Dozens of bodyguards were hired by her father. Saying he considered that Hearst's actions had not been voluntary, Superior Court judge Talbot Callister gave her probation on the sporting goods store charge when she pleaded no contest. California Attorney General Evelle J. Younger said if there was a double standard for the wealthy it was the opposite of what was generally believed, and though Hearst had no legal brainwashing defense there was a good deal of equity favoring her in the essential point that everything started with her kidnapping. Hearst's bail was revoked in May 1978 when appeals failed and the Supreme Court declined to hear her case'. Wikipedia.

Her appeals had failed and the Channel Nine letter arrived on May 2nd, threatening to kill both Daryl Gates and Edward Davis. But why were these names top of the letter's hit list?

Daryl Gates was born Darrel Gates (as the Channel Nine letter stated).
​
'While not the first to use specially trained units, the LAPD was the first to form a police tactical unit, and originally created the term, "Special Weapons And Tactics". John Nelson was the LAPD officer who came up with the idea to form a specially trained and equipped unit in the LAPD, intended to respond to and manage critical situations involving shootings while minimizing police casualties. In 1967, Nelson's CO, then-Inspector Daryl F. Gates approved this idea, and he formed a small select group of volunteer officers. This first SWAT unit initially consisted of fifteen teams of four men each, for a total staff of sixty. These officers were given special status and benefits. They were required to attend special monthly training. This unit also served as a security unit for police facilities during times of civil unrest.

In 1971, SWAT personnel were assigned on a full-time basis to Metropolitan Division to respond to continuing action by subversive groups, the rising crime rate and the continuing difficulty of mustering a team response in a timely manner. Metropolitan Division, which had a long-established reputation as the tactical unit of the Department, was reorganized into 6 units: "A", "B", "C", "D", "E", and "K-9" Platoons. The Special Weapons And Tactics Unit was given the designation of "D" Platoon, and at the same time formally adopted the acronym SWAT.

The first significant deployment of LAPD's SWAT unit was on December 9, 1969, in a four-hour confrontation with members of the Black Panthers. The Panthers eventually surrendered, with three Panthers and three officers being injured. By 1974, there was a general acceptance of SWAT as a resource for the city and county of Los Angeles.

On the afternoon of May 17, 1974, elements of a group which called itself the Symbionese Liberation Army (SLA), a group of heavily armed leftists, barricaded themselves in a residence on East 54th Street at Compton Avenue in Los Angeles. In response, more than 400 LAPD officers, Federal Bureau of Investigation (FBI) agents, Los Angeles County Sheriff's Department (LASD) deputies, California Highway Patrol (CHP) officers, and Los Angeles Fire Department (LAFD) firefighters surrounded the residence. Coverage of the siege was broadcast to millions via television and radio and featured in the world press for days after. Negotiations were opened with the barricaded suspects on numerous occasions, both prior to and after the introduction of tear gas. Law enforcement units did not fire until the SLA had fired several volleys of semi-automatic and fully automatic gunfire at them. In spite of the 3,772 rounds fired by the SLA, no civilians or sworn personnel sustained injury from gunfire.

During the gun battle, a fire erupted inside the residence. The cause of the fire is officially unknown, although police sources speculated that an errant round ignited one of the suspects' Molotov cocktails. Others suspect that the repeated use of tear gas grenades, which function by burning chemicals at high temperatures, started the structure fire. All six of the suspects suffered multiple gunshot wounds and perished in the ensuing blaze.
By the time of the SLA shoot-out, SWAT teams had reorganized into six 10-man teams, each team consisting of two five-man units, called elements. An element consisted of an element leader, two assaulters, a scout, and a rear-guard. The normal complement of weapons was a sniper rifle (apparently a .243-caliber bolt-action, judging from the ordnance expended by officers at the shootout), two .223-caliber semi-automatic rifles, and two shotguns. SWAT officers also carried their service revolvers in shoulder holsters. The normal gear issued them included a first aid kit, gloves, and a gas mask. In fact it was a change just to have police armed with semi-automatic rifles, at a time when officers were usually issued six-shot revolvers and shotguns. The encounter with the heavily armed Symbionese Liberation Army, however, sparked a trend towards SWAT teams being issued body armor and fully automatic weapons of various types'. Wikipedia.

'The public became aware of SWAT in May of 1974, when a shoplifting incident at an Inglewood sporting goods store led investigators to a South Los Angeles home on 54th Street. The Symbionese Liberation Army and heiress Patty Hearst, who were barricaded inside, exchanged gunfire with tactical officers for two hours before surrendering. Six SLA members were killed, as thousands of rounds of ammunition was used. The incident, which unfolded on live television, brought home the usefulness of SWAT to Gates, who was the field commander of that incident'. Policemag.com

Edward Davis was the chief of the Los Angeles Police Department from 1969 to 1978. He instantly became well-known internationally in 1969 when he held a press conference announcing the arrests of Charles Manson and his followers for what are known as the Tate and LaBianca murders. His role is well-documented in the book Helter Skelter, written by Vincent Bugliosi, the prosecutor in the case. Wikipedia.

In an NBC News article reporting his death in 2006, it led with the words "Ed Davis, the tough-talking former Los Angeles police chief who led the department during its shootout with the Symbionese Liberation Army and the arrest of Charles Manson, died Saturday, a family spokesman said. He was 89".

You don't have to search hard on the internet to discover that Daryl Gates and Edward Davis were instrumental in the demise of the Symbionese Liberation Army and the deadly shootout on May 17th 1974 which resulted in the deaths of six of its members. The Zodiac Killer had never crossed swords with either of these two law enforcement officers and had absolutely no reason to want to threaten them with death, as displayed in the Channel Nine letter. On the contrary, an ex-member, close associate or sympathizer of the Symbionese Liberation Army had every reason to want to see these two LAPD servants dead. The author of the Channel Nine letter held them personally responsible for the slaying at 1466 East 54th Street.

On April 24th 1978, the author of the 1978 letter wrote "I am waiting for a good movie about me, who will play me". Eight days later, the Channel Nine letter was mailed to ​KHJ-TV in Los Angeles on May 2nd 1978, stating "Hey you actors, this is your lucky break. Whoever plays me has his work cut out for him". There is every chance that, if the Channel Nine letter was mailed by an associate or somebody sympathetic to the S.L.A cause, then the 1978 letter (widely regarded as a hoax anyway) was also mailed by somebody in and around the Symbionese Liberation Army circle. This wouldn't be the first time that somebody connected or loosely affiliated with the militant group mailed a letter pretending to be the Zodiac Killer. The 1974 S.L.A letter was almost certainly unconnected to the Bay Area murderer, and the remaining three 1974 letters are widely questioned.   


https://www.zodiacciphers.com/zodiac-news/sla-letter-not-zodiac-and-here-is-the-fbi-file-to-prove-it

On April 1st 2019 a new true crime podcast was launched entitled The Murder Squad. Featuring former detective and investigator Paul Holes, pivotal in the capture of the Golden State Killer, and investigative journalist Billy Jensen, it will tackle an array of unsolved cold cases and employ the listener as a valuable crime fighting tool through social media. 

Episode 1 is now available, seeking your help in identifying possible victims of the now deceased murderer William Richard "Bill" Bradford, who photographed 54 women in various poses, quite possibly moments before they were murdered. 

Anybody who is instrumental in helping solve a case will be credited, but the motivation for doing so should be primarily driven by a desire to seek some form of closure for the victims families and friends. Visit the Murder Squad by clicking the above link. 

After five murders in a matter of 10 months in 1968 and 1969, followed by numerous communications, 1971 was a watershed year for the Zodiac Killer. When all is said and done, it will probably be remembered as the year Zodiac tried to convince law enforcement he had committed four brutal stabbings, when in fact he had committed none. The Zodiac legacy was coming to an end and his final two communications in the latter half of 1971 failed to make the newspapers, ultimately marking the final days of the Zodiac Killer. He wouldn't be heard from again. When Paul Avery wrote the San Francisco Chronicle article 'New Evidence in Zodiac Killings' on November 16th 1970, it must have been a heavenly blessing for the Zodiac Killer. He was being linked to the Cheri Jo Bates murder in Riverside on October 30th 1966. He would gladly accept this offering on March 13th 1971 when he unashamedly wrote a letter stating "I do have to give them credit for stumbling across my riverside activity, but they are only finding the easy ones, there are a hell of a lot more down there". A man inspired to attack Bryan Hartnell and Cecelia Shepard with a knife at Lake Berryessa, driven by the front page coverage of the August 3rd 1969 Snoozy/Furlong murders in San Jose - something he yearned - not only laid claim to the murder of these two young girls in the November 8th 1969 'Dripping Pen' card, but was only too happy to claim another in Riverside. 

​Then, just one month later, a gift arrived from the Vallejo Times-Herald on April 13th 1971, when the Zodiac Killer saw the words "One thing's certain, Miss Bilek's murder is almost a carbon copy of a double killing Santa Clara County" homicide detective said. "And all three could well be the work of the so-called Zodiac".

The Zodiac saw the publicity generated from the brutal stabbing of Deborah Furlong and Kathy Snoozy on August 3rd and capitalized on this at Lake Berryessa in September. It had now paid dividends on April 11th 1971, when Kathy Bilek (18) visited Villa Montalvo in Saratoga, having planned to read a paperback book (The Gabriel Hounds) and engage in a spot of bird watching​ in the seclusion of a remote, wooded portion of the park, near a small stream. Her body was found the next day by her father, Charles, while Santa Clara County Sheriff's deputies searched nearby. She had been stabbed 17 times in the back and 32 times in her chest and stomach. This crime was obviously linked to the Snoozy/Furlong murders because of the extensive knife wounds and the locality. But by committing the savage knife attack on Bryan Hartnell and Cecelia Shepard at Lake Berryessa and hinting at his involvement in the San Jose murders of Snoozy and Furlong, the Zodiac Killer had now been given the opportunity by Paul Avery to accept the Riverside murder in 1966, along with the Kathy Bilek murder by the Vallejo Times-Herald on April 13th 1971. His switching to a knife in the commission of murder would inevitably lead law enforcement to link him to more crimes - something he knew only too well.

The 'Monticello' card mailed on July 13th 1971 was open-ended. It didn't directly claim the murder of Kathy Bilek, thereby allowing him a get out clause should this crime be later attributed to somebody else. The Zodiac Killer had used this tactic before when he insinuated his involvement in the murder of Officer Richard Radetich by stating "I shot a man sitting in a parked car with a .38". Then in the 'Pines' card, by again offering a cryptic message open to interpretation. He never actually claimed the murder of Cheri Jo Bates, simply stating "I do have to give them credit for stumbling across my riverside activity". Everything designed in such a fashion to avoid full admission.

The "August" reference on the 'Dripping Pen' card, while not actually writing it on the car door of Bryan Hartnell's vehicle, had metaphorically opened the door to the speculation shown by law enforcement in the article by the Vallejo Times-Herald. The September 27th 1969 attack, effectively enabled the Zodiac Killer to extend his reign of terror far beyond the shores of Lake Berryessa, into the heart of San Jose. The July 13th 1971 'Monticello' card was now the fifth communication referencing San Jose in the last 20 months - but there was still time for one more.

The final communication of 1971 may have been the elusive 'Sacramento DMV' letter, probably mailed in the November or December of 1971. This correspondence likely mirrored the November 21st 1969 San Jose letter and code, in which the Zodiac Killer mailed a correspondence to the San Jose Police Department and threatened a "widow". I have little doubt this woman had some involvement in the Deborah Furlong and Kathy Snoozy murders from the perspective of an eyewitness, and by Zodiac threatening her, he was effectively giving the impression that the murders were somehow pertinent to him. The Sacramento DMV letter was used for the same purpose - to keep the Zodiac story alive by means of interjection.  
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In October 1971, a magazine publication entitled 'True Detective' comprehensively featured the murders of Kathy Snoozy, Deborah Furlong and Kathy Bilek, and the subsequent arrest of Karl Francis Werner. There is every chance the Zodiac Killer read this magazine article, compelling him to continue his contact with authorities regarding these murders.

One particular section about Kathy Bilek caught my eye - that may have been the reason why the Zodiac Killer wrote a letter to the chairman of the DMV in Sacramento. It stated "At about the same moment, Park Ranger Ken Williamson was informing a member of the investigative team that he, too, had noticed a tall, bespectacled young man who had been a frequent visitor at Villa Montalvo. He was a loner and had impressed the Villa's ranger staff with his almost furtive conduct, said Williamson. The ranger had jotted down the license number of the strange youth's auto.
The license number was forwarded to the California Department of Motor Vehicles headquarters in Sacramento, the state's capital 150 miles to the north of San Jose. The information teletyped back from the registration bureau was that the auto was the property of a Karl Francis Werner, living at an address on Shawnee Lane in San Jose."

This was the final entry point of the Zodiac Killer. The 'Monticello' card and 'Sacramento DMV' letter had failed to hit the newspapers - and the reign of the Zodiac Killer had reached its end. The arrest of Karl Francis Werner for the three murders in San Jose had finally exposed the Zodiac Killer for the fraud he had metamorphosed into. The long shadow he had cast over the Bay Area of Northern California was starting to recede - and he knew his days were numbered.