Have you ever wondered who inspired the Zodiac Killer to mail in a piece of Paul Stine's bloody shirt after the murder in Presidio Heights in 1969? The same member of law enforcement who influenced the arrival of the Zodiac pseudonym on August 4th 1969. The only reason the 'Debut of Zodiac' letter was ever sent to the San Francisco Examiner is because Vallejo Police Chief, Jack E. Stiltz requested the writer of the July 31st letters to prove he was the killer, asking the murderer of three to write another letter "with more facts to prove it". This request by Vallejo Police Chief, Jack E. Stiltz was published in the San Francisco Chronicle on August 2nd 1969, followed by the San Francisco Sunday Examiner & Chronicle on August 3rd 1969.

​The Zodiac Killer's response was swift, sending a letter to the San Francisco Examiner on August 4th 1969, replying directly to Jack Stiltz and stating "In answer to your asking for more details about the good times I have had in Vallejo, I shall be very happy to supply even more material". Without this prompt by Jack Stiltz, the pseudonym of "Zodiac" may never have come to pass - at least not by August 4th 1969.

The next communication was mailed just over two months later, on October 13th 1969, admitting to the murder of Paul Stine in Presidio Heights only two days earlier. But the Zodiac Killer hadn't forgotten that Vallejo Police Chief, Jack Stiltz had doubted his involvement in the attacks at Lake Herman Road and Blue Rock Springs, by stating he required "more facts to prove it". So, the Zodiac Killer in advance of the taxicab driver's murder, decided to remove a piece of the victim's shirt and leave law enforcement in no doubt he was the true killer at Presidio Heights. Two days later, he mailed the Stine letter, stating "I am the murderer of the taxi driver over by Washington St + Maple St last night, to prove this here is a blood stained piece of his shirt". The Zodiac Killer was responding to law enforcement who doubted him previously, but primarily to Jack Stiltz's comments in the newspapers back on August 2nd and August 3rd 1969. 

In his next descriptive letter on November 9th 1969 the Zodiac Killer would continue this theme, with Vallejo Police Chief, Jack Stiltz still in the back of his mind. The Zodiac Killer was angry with the San Francisco Police Department for "telling lies" about him, threatening to change his way of collecting slaves for the afterlife. He would finish this communication by warning San Francisco law enforcement not to bluff him, by stating "To prove that I am the Zodiac, Ask the Vallejo cop about my electric gun sight which I used to start my collecting of slaves." Jack Stiltz was the "Vallejo Cop" that the Zodiac Killer addressed on August 4th 1969 when he wrote to the San Francisco Examiner and described his "small pencel flash light (taped) to the barrel of (his) gun". 

​Therefore, Vallejo Police Chief, Jack Stiltz was instrumental to the August 4th 1969 'Debut of Zodiac' letter in which the pseudonym "Zodiac" was revealed to the world, as well as the inspiration for the Zodiac Killer to decide in advance of his San Francisco murder, that something from the victim (a shirt piece in this instance} had to be mailed with his next correspondence, "to prove" undeniably he was the killer.     

The Zodiac Killer murdered David Faraday and Betty Lou Jensen in Benicia on December 20th 1968, before moving into Vallejo on July 4th 1969 with the attack at Blue Rock Springs on Darlene Ferrin and Michael Mageau. He had successfully committed two late night attacks on two young couples - and by the time he had mailed his July 31st 1969 letters and cryptograms to the San Francisco Chronicle, San Francisco Examiner and Vallejo Times-Herald newspapers - the police were no nearer to catching him. By all accounts, this seemed a rather 'successful' opening to his serial killer career, evolving from the murderer of three into the ominous Zodiac Killer by August 4th 1969. This being the case, why did the Zodiac Killer rip up this template of murder and embark on a whole new path on September 27th 1969, leaving many observers to this day questioning the Lake Berryessa stabbings as a Zodiac crime? Rather than constantly examining the modus operandi between the three crimes and questioning their incompatibility with one another, it may be more productive to discover the reasons why the Zodiac Killer dropped an approach that had worked on December 20th 1968 and July 4th 1969, to now adopt a brazen attack with a knife in daylight hours. Something happened externally or internally to provoke this switch in attack style.

The Zodiac Killer by August 4th 1969 had murdered three people, severely injured one, mailed three cryptograms and written four letters. From the outset he placed importance on receiving front page coverage. On July 31st 1969, his trinity of communications demanded that he received front page coverage, stating "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". Imagine his horror and dismay, that the highest circulation newspapers in the Bay Area ignored his demands and relegated the cryptic murderer of three into relative anonymity on their inner pages. The San Francisco Chronicle published his cryptogram on page four, while the San Francisco Examiner (had in his eyes), literally spat in his face, by placing their portion of the cryptogram on a lowly page nine. This wouldn't go unnoticed by the killer of three on August 4th 1969, who hastily composed a fourth letter with an imposing pseudonym and uttered his displeasure by stating "I was not happy to see that I did not get front page coverage". We have come to understand the Zodiac Killer as a narcissistic braggart, whose primary objective wasn't the murders, but the publicity they generated. This publicity, to him, meant front page coverage in the major newspapers of the day - not page four and certainly not page nine. 

Just when the Zodiac Killer didn't think it could get any worse, the San Francisco Chronicle ran a front page article on August 6th 1969, entitled The Frenzy of San Jose Girls' Slayer, detailing the brutal stabbing murders of two young teenagers in San Jose on August 3rd 1969. This article arrived just two days after his dismay at not receiving front page coverage. The San Francisco Chronicle article read as follows:

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.

PUZZLE: 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.

INVESTIGATION: So far, according to Chief of San Jose Detectives Barton Collins, his investigators have uncovered no solid clues to the slaying. He said police and sheriff's deputies are looking for a "light colored van—a Volkswagen, a Dodge, a Chevrolet or a Ford" in which the girls may have been killed and then rolled, carried or dragged down the hillside to a grove of snarled, dusty oaks where their bodies were found. Both he and the coroner emphasized that at the scene there was almost no blood, suggesting they had been slain elsewhere. Collins said he and his men have talked to at least 200 people so far, searching for some information that might draw them closer to the killer. Asked if he were looking for a "mad man," Collins, pale and exhausted, snapped: "I'm looking for a killer and it doesn't matter whether he was under drugs or what." Collins did not mention this, but the Chronicle learned that wedged in between the two bodies of the dead girls police found a "new," but empty beer can. There was speculation the killer may have rolled or carried one girl down, then finished off a can of beer, and then disposed of the second body without noticing the can. The scene, not more than six blocks from where the two girls lived with their families in a neat, prosperous subdivision in San Jose's Almaden area, was utterly desolate yesterday. A few small boys on bicycles paused to look up at the tanned knoll, swathed with wide paths used for scrambles by neighborhood motorcyclists, and scurried off. Normally scores of children play in that area, because, in the words of Deborah's father, Glen Furlong, "It's the only open area close by where kids can go to." Housewives living in the immediate area, across the street and around the corner, conceded they were suddenly "very frightened." One mother said that since the murder she had seen some children poking around the scene, and added, "We were shocked. "Maybe their parents don't care. But I wouldn't let mine go up there . . . "

PUBLICITY: Although very close to tears, Furlong said yesterday that he was allowing interviews in the hope that more and more publicity "would trigger something in someone's mind and we can solve this crime." The 40-year old father works at the big International Business Machines plant only about a mile away from the family home. He is a senior associate engineer in the logic design section of IBM and he tried to bring objectivity to the disaster that has befallen his family. "The individual or individuals who did this either had to be deranged or high on dope or something of that nature," he said. "They didn't know what they were doing. It was such a senseless killing." He said his neighborhood has never had any problems, although mahy complain about the noise made by the weekend cyclists. He noted parenthetically that the riders are not of the Hell's Angel variety, but use lighter motorcycles. He said his neighbors were "very sympathetic," but complained he found some of his phone calls "very disconcerting."

CALLERS: "On several occasions people have called and as soon as we answer, they hang up," he said in bewilderment. Furlong tried to control his emotions as he spoke of his eldest daughter — one of his four children. "She was only a freshman in high school," he said, "and this was the first year we allowed her to date. We talked to her about it, and I sort of teased her. She went out with a boy friend a few times — a very nice boy who came over yesterday morning to extend his condolences — but most of her social activities were confined to her school. She was never any trouble." School mates and neighborhood friends of Deborah said the girl, very slim and looking more like a 10-year-old than a 14-year-old, was "just an ordinary nice girl who baby set and had a boy friend and talked about becoming an airline stewardess."

CHILDREN: The other Furlong children are Glen, 16; Floyd, 12, and Pamela, 11. Furlong said he did not know and had not yet talked to Kathy's parents, Mr. and Mrs. Wilfred Snoozy. Both Snoozy, a carpet layer, and Mrs. Snoozy reportedly are in a state of collapse. Her funeral has been scheduled Friday at 11 a.m. at the Place Funeral Home in Los Gatos. Burial will be at Oak Wood Cemetery in Santa Cruz. Funeral services for Kathy will be held tomorrow (Thursday) at 2 p.m. at the Oak Hill Memorial Park Mortuary in San Jose. Burial will be at Oak Hill Memorial Park.  

The Zodiac Killer, avidly scanning the newspapers for progress on his cryptograms and latest letter, must have been bitterly disappointed that these murders committed in San Jose featured front and center of the San Francisco Chronicle, while his three murders, allied to his cryptic ciphers, were relegated to page four and nine of the two San Francisco newspapers. He needed to switch his approach to murder and hit San Francisco hard.

The phrases of "The Nazi sex mutilations during World War II were nothing compared to what was done to these young girls", the title of "The Frenzy of San Jose Girls' Slayer" and "Dr. Hauser, so shaken by the brutality of the crime he could scarcely find words", must have resonated with the Bay Area murderer. He knew that to generate the front page coverage he so badly craved, he needed to switch from gun to knife in a savage close-quarter attack. However, he needed to elevate the fear by dressing up in a costume with his moniker emblazoned on his chest, akin to the fear the Nazi swastika instilled in its victims. He would also ramp up the terror by using a bayonet-style knife, rather than the pocket knife used in the Snoozy and Furlong murders. This article alone was the driver behind the Lake Berryessa stabbings, and effectively sealed Bryan Hartnell and Cecelia Shepard's fate, seven weeks in advance of the crime. The Zodiac Killer, dressed in ordinary clothes, gazed into the mirror and effectively saw the costumed Lake Berryessa murderer staring back at him. His fantasy was taking shape.         

Three girls from Pacific Union College may have been the initial target of the Zodiac Killer as he scoured the hillsides of Lake Berryessa, but circumstances unknown would ultimately change what transpired. Two hours later, an ominous figure stepped out from behind a tree at Twin Oak Ridge and bore down on Bryan Hartnell and Cecelia Shepard. The Zodiac Killer's fantasy, driven by the August 6th 1969 San Francisco Chronicle article, had emerged into reality. The Snoozy and Furlong murders on August 3rd 1969 were about to be replicated in the mind of a killer. The costume specifically designed and crafted with care, by a man who fed into his own narcissism and who was now on the verge of securing the recognition he felt he so richly deserved. Whether the couple survived the upcoming attack and reported what they saw was incidental - the Zodiac Killer had now satiated his desire to become the embodiment of fear, he viewed as being denied from him and his accomplishments after the trinity of cryptic communications on July 31st 1969.

After the attack on the couple, he made his way up the hillside to the Volkswagen Karmann Ghia of Bryan Hartnell and defiantly listed his accomplishments on the door of the vehicle, but specifically added the words "by knife" at the foot of the message. He was effectively making a statement to the San Francisco Chronicle (and to a lesser extent, The Examiner), "do I get front page coverage now". The Snoozy and Furlong murders, in his mind, had overshadowed his accomplishments at Lake Herman Road and Blue Rock Springs, despite the cryptic offerings he had so painstakingly crafted. So he crafted a costume instead and attempted to ramp the fear factor to a new level. The fact that Bryan Hartnell survived the Lake Berryessa attack, inadvertently played right into his hands. The evil, fear-inducing costume he had carefully crafted and labored over, was now the focus and feeding frenzy of a media gripped by this new revelation. The second coming of Zodiac was now complete - and his requirement to converse with the newspapers strangely deflated, because Bryan Hartnell had successfully recounted the details of Lake Berryessa with astonishing clarity and vividness. The Zodiac Killer had now been reborn and resurrected from gun-toting lunatic into the embodiment of evil. This crime also had one added benefit with respect to the identity of the killer of Snoozy and Furlong - and I doubt this possibility escaped the attention of the Zodiac Killer when he arrived at Lake Berryessa on September 27th 1969.    

In an article entitled Another Grim Message by Paul Avery, a link between the Lake Berryessa stabbings and the murder of the two San Jose teenagers was pondered by both investigators and newspapers alike. The Zodiac Killer had deliberately emphasized "by knife" on the car door at Twin Oak Ridge, and included "Aug" in his victim months on the Dripping Pen card for this very reason. When he mailed the November 8th 1969 Dripping Pen card, he requested "I though you would nead a good laugh before you hear the bad news. You won't get the news for a while yet. PS could you print this new cipher in your frunt page? I get aufully lonely when I am ignored, so lonely I could do my Thing !!!!!!  Des July Aug Sept Oct = 7". The Zodiac Killer didn't need to demand front page coverage anymore, he knew he would get it. By committing the Lake Berryessa stabbings and including "Aug" in his chronology of months, he had effectively planted the seed in investigators minds that he could have been responsible for the Snoozy and Furlong murders in August. He had essentially bought himself front page coverage by piggybacking off a crime he already knew had achieved this status on August 6th 1969.
Just like the threat to pick off schoolchildren and blow up a school bus, the savagery of these two close-quarter attacks demanded he be taken seriously. Whatever we say about the Zodiac Killer, his marketing skills were second to none. He knew how to turn page four and page nine into page one, placing Another Grim Message proudly on the news stands of San Francisco.    

The importance of the San Francisco Chronicle article from August 6th 1969 cannot be underestimated with respect to Lake Berryessa and future Zodiac communications. Who would remember the burial location of one of the victims from San Jose, if not the killer who was so influenced by this very article? Who then shifted from impersonal double shootings at Lake Herman Road and Blue Rock Springs, to intimate stabbings at Lake Berryessa. Only somebody invested in murder during the time  period this article was released, would have reason to remember where the two San Jose teenagers were laid to rest. Under CHILDREN in the August 6th 1969 Chronicle article, it stated "The other Furlong children are Glen, 16; Floyd, 12, and Pamela, 11. Furlong said he did not know and had not yet talked to Kathy's parents, Mr. and Mrs. Wilfred Snoozy. Both Snoozy, a carpet layer, and Mrs. Snoozy reportedly are in a state of collapse. Her funeral has been scheduled Friday at 11 a.m. at the Place Funeral Home in Los Gatos. Burial will be at Oak Wood Cemetery in Santa Cruz. Funeral services for Kathy will be held tomorrow (Thursday) at 2 p.m. at the Oak Hill Memorial Park Mortuary in San Jose. Burial will be at Oak Hill Memorial Park".

The Oak Hill Memorial Park & Cemetery in San Jose lies in the Monticello neighborhood, just nine miles east of the Villa Montalvo woods, where Kathy Bilek was brutally stabbed on April 11th 1971 - and who the Zodiac Killer referenced in his July 13th 1971 communication, stating "Near Monticello Shought Victims 21 ...... In The Woods Dies April". There are a multitude of places in San Jose the author of this card could have chosen, but he chose Monticello. The exact place Kathie Snoozy was buried - and the teenager whose murder he insinuated his involvement in on November 8th 1969. When Karl Francis Werner was attributed with the murders of Debra Furlong, Kathie Snoozy and Kathy Bilek, the Zodiac Killer had the option to recuse himself of all involvement in the two San Jose murders. But that wasn't his style. The attack at Lake Berryessa, the Dripping Pen card, and a whole host of communications involving San Jose had locked him into a lie he was unwilling to relinquish. He would effectively try to reclaim the Snoozy and Furlong murders, by also claiming the Kathy Bilek murder in Saratoga via the Monticello card, as well as calling Werner a phony in another Zodiac communication mailed in May 1971 (shown below). The Zodiac Killer had simply invested too much time and effort into this elaborate facade, that was encapsulated by his theatrical performance at Lake Berryessa. Two years he had lived in a house of illusion - and Karl Francis Werner was not going to tear it down. 

Covered many times before, I would like to highlight what I believe is the most important aspect of the case with respect to locating and identifying the elusive Zodiac Killer (and because I've run out of material). This analysis is far from foolproof, but it relies on the instincts of a killer in the immediate aftermath of an attack or murder. I remember an episode of Dark Minds featuring M. William Phelps and John Kelly, in which an incarcerated serial killer stated his primary objective after the murder of a stranger, was to put as much distance between the victim and himself as soon as possible. Without any personal connection to his victim, there was no need for extensive concealment of the crime or interaction subsequent to the murder. The longer you linger in the near vicinity, the greater the risk of capture. This is exactly what happened at Blue Rock Springs Park on July 5th 1969, in which the Zodiac Killer failed to put the necessary distance between him and the crime scene that was available to him. He took 40 minutes to reach a payphone only 8-10 minutes away, effectively wasting 30 minutes in the interim. It has been suggested that the Zodiac Killer possibly parked up his vehicle and watched the unfolding events from a discreet location, or even went for a drink or bite to eat. While this is not impossible, is it the most realistic choice after a brutal attack near midnight on July 4th 1969?  

If you take a look at the Blue Rock Springs parking lot in the police report, it shows the bullet casings (slag) marked to the left of the passenger door, as though the bulk of the casings ejected to the shooter's left. Seven bullet casings were retrieved from this location, with two casings discovered on the back floorboard of the Corvair. This indicates that the killer must have leaned a considerable distance into the Corvair when returning and targetting Michael Mageau for the second time. At this juncture, Darlene Ferrin had been struck three times and Michael Mageau twice, having thrust himself backwards over the rear of the front passenger seat. There is a high probability that a killer leaning into the vehicle and over the front seat to sight Michael Mageau for the final two shots, would receive blood transfer from the vehicle interior onto his short-sleeved blue shirt. If the firearm continued to eject casings laterally, the gun would likely have to be some distance inside the vehicle for two of the casings to remain in the back passenger area of the Corvair. Any blood transfer from the seating to the perpetrator would now be a problem (whether the murderer has a jacket or not). Would a killer now choose to remain in the area 30 minutes longer than necessary in a public setting, seek refuge or place as much distance between himself and the crime scene as conceivably possible?         

A killer living in San Francisco would greatly diminish his chances of getting caught by heading home immediately, and making any desired phone call to police from somewhere equidistant to the crime scene and his residence (such as Richmond or Novato), rather than linger in the near vicinity he was last seen heading by Michael Mageau. He risks vehicle identification, along with incrimination through blood transfer to his clothing and gunshot residue. Not withstanding, he may still be in possession of the firearm. If the killer had originally intended to make the phone call to police from the Springs and Tuolumne payphone immediately (before the crime had been discovered), then something changed those plans. He effectively took 40 minutes to accomplish a task that should have taken no more than 10 minutes. Visible blood transfer to his arms and clothing may have been the deciding factor. Head home and separate yourself from the vehicle, blood transfer, gunshot residue and clothing. Then, without any visibly incriminating evidence, head back to the nearest payphone to make the telephone call you so badly wanted to make. This is also not without risk, but significantly lower than being spotted covered in blood. 

Law enforcement would very likely have canvassed the area around the Springs and Tuolumne payphone for eyewitnesses to the call, and scoured the near vicinity for any vehicle identified by Michael Mageau. The Zodiac Killer probably used the appeal from Vallejo Police Chief Jack E. Stiltz, who requested the writer to send a further correspondence "with more facts to prove it", as an opportunity to put distance between his residence and the payphone. He sent a correspondence to the San Francisco Examiner on August 4th 1969 with some very useful information to help police. Having never mentioned any of his victims by name, or dwelled on their actual killings, before or since, he was extremely helpful in providing police with a extremely detailed and convenient eyewitness to his payphone call. Not only did this eyewitness see Zodiac make the telephone call, but he was very helpful in providing police with the color of the Zodiac Killer's vehicle. The problem is, the police don't seem to have any recollection of this "shabbily dressed negro male, about 40-45 years of age" in the police report, or in the subsequent 51 years. Despite the fact an admission of his existence and his contact with police, would place him in no jeopardy whatsoever in 2020, there has been no report or spoken word that this negro male ever existed. The over descriptive nature of this helpful eyewitness by Zodiac, seemed designed to convince the reader that Zodiac was driving around in a brown car 40 minutes after the Blue Rock Springs attack.       

Why does a killer have to invent an eyewitness to his telephone call, if not to achieve a purpose? If law enforcement had been canvassing the local area, this was the perfect opportunity to redirect the police's attention. You first create a credible eyewitness by detailing his ethnicity, age range and what clothing he was wearing. Then your eyewitness can corroborate the testimony of Michael Mageau, who had on numerous occasions described his attacker's vehicle as brown. This adds validity to the claim of Zodiac, who is effectively cementing the notion of him driving around in a brown car. However, if police knew that no negro male had come forward with this information, then understandably they would have realized that the Zodiac Killer was selling them a story and justifiably have come to the conclusion that his vehicle wasn't brown at all. I highly doubt any serial killer voluntarily surrenders incriminating or helpful information to narrow the police search. In fact, the Zodiac Killer may have been doing quite the opposite.

It is my contention that the purpose of the section of letter highlighted above was primarily designed, not to throw police a curveball about the color of his vehicle, but to sell a story that he was still driving around in his vehicle. Why would a killer still be in this vicinity only 10 minutes from the Blue Rock Springs parking lot, 40 minutes later? Especially if he hadn't distanced himself from numerous pieces of incriminating evidence. The mention of my "car was brown" wasn't designed with the color of his vehicle in mind, it was designed to indicate that an eyewitness had corroborated he was still in possession of his vehicle through the testimony of Michael Mageau. The emphasis was placed on an eyewitness "walking by" to conveniently spot Zodiac as the phone rang, which drew his "attention to me + my car". The Zodiac Killer stated in the August 4th Debut letter, that "When I hung the phone up the damn thing began to ring & that drew his attention to me + my car". The mention of his car in this sentence is not required, other than to convince the reader he was still in tandem with his vehicle and could drive anywhere after the payphone receiver had been hung up. He chose his words carefully, so not to reveal he had walked to the payphone from a residence nearby. A residence he had to travel to immediately after the attack, because of blood transfer to his person from leaning inside the Corvair of Darlene Ferrin. The cries of Michael Mageau may have been his undoing. 

The Zodiac Killer, being the narcissist he was, very likely kept the newspapers or cuttings of his reported crimes. It can be seen from the above excerpts that the Zodiac Killer carefully crafted his responses to particular sections of the newspaper text. That is, until he completely deviated off script when writing "The man who told police that my car was brown was a negro about 40-45 rather shabbly dressed. I was in this phone booth having some fun with the Vallejo cop when he was walking by. When I hung the phone up the damn X@ thing began to ring & that drew his attention to me + my car". There was no mention whatsoever of a negro male adult identifying the vehicle of Zodiac, either from the police or in any newspaper by the time the Zodiac Killer sent his August 4th 1969 letter. The Zodiac Killer, who carefully read every detail about himself during a 6 1/2 month period (from December 23rd 1968 to July 6th 1969 in the examples above), had suddenly and apparently crafted a "negro about 40-45, who was rather shabbly dressed" out of thin air, in total contrast to his specific responses to the San Francisco Chronicle and Vallejo Times-Herald. 

The following will examine the claim that the author of the August 4th 1969 Debut of Zodiac letter may have acquired his information directly from the Blue Rock Springs police report and not the Vallejo Times-Herald newspaper, as the August 4th letter stated. If this were true, it could mean that [1] The Zodiac Killer had access to the police reports, or [2] The author of the Debut of Zodiac letter was not the killer, but somebody laying claim to the two attacks thus far under the Zodiac pseudonym. Either way, this would have major ramifications regarding the Zodiac story as a whole. Below is a newspaper cutting from the Vallejo Times-Herald on July 6th 1969 (two days after the attack at Blue Rock Springs Park).  

George Bryant lived just 800 feet from the parking lot at Blue Rock Springs and recalled the firecrackers and gunshots that night. As the murderer's vehicle left the scene, George Bryant described "the car take off at a high rate of speed, peeling rubber and cutting corners. He wasn't sure, but he thought it was headed to the freeway". The author of the Debut of Zodiac letter claimed this is where he read about the version of events by George Bryant, retorting "I did not leave the cene of the killing with squealling tires + raceing engine as described in the Vallejo paper. I drove away quite slowly so as not to draw attention to my car". 

There is a subtle difference between the two accounts, in that the Vallejo Times-Herald newspaper article refers to peeling rubber, whereas the Debut of Zodiac letter alters this to squealling tires. When we take a look at page 15 of the Blue Rock Springs police report regarding George Bryant, it states that after the gunshots ceased "he then heard a car take off at super speed and it burned rubber and was squealing its tires as it sped along the road". 

It can be seen that the "Zodiac Killer" in the August 4th 1969 Debut letter described squealling tires, while the police report on July 7th 1969 described the car as squealing its tires. Is this an unfortunate coincidence of common phraseology, or did the author of the Debut of Zodiac letter inadvertently use the language he had read in the Blue Rock Springs police report?.

The Zodiac Killer gave us the answers to his six unsolved ciphers by March 13th 1971 without ambiguity, but effectively gave us all the answers by October 27th 1970. It is important to read Three Months After the Mount Diablo Code to understand all of the following, but I shall give a very brief recap. The Zodiac gave us the answer to the Mount Diablo code (32 symbol Cipher} in the Little List Letter on July 26th 1970. In fact, he gave us the answer word for word, in the form of Radians and 5 inches along the radians (all we had to do was add the number 5 where he placed the arrow and hashtag}. The 13 Hole Postcard on October 5th 1970 gave us the answer to the 13 Symbol Cipher word for word, in the form of Fk I'm crackproof. The Halloween Card on October 27th 1970 gave us the answer to the 340 Cipher word for word, in the form of Paradice and Slaves. No mathematics was required and no manipulation was needed - all we had to do, was use the three phrases that Zodiac provided us with in three consecutive communications, to answer the three previously unsolved ciphers. But that wasn't all. The Zodiac gave us the answer to both the Fairfield Letter codes of December 7th and 16th of 1969, again word for word using the Halloween Card. The 18 unsolved characters in the 408 cipher he again gave us the solution word for word, using the trinity of communications on July 31st 1969 and following letter on August 4th 1969, when he revealed his pseudonym to the world. However, there is even more.

The Zodiac Killer's 408 Cipher was effectively a written message that he enciphered into characters. When you take a look at the decoded message, it isn't structured and organized - because one line or row bleeds into the following. The Zodiac Killer didn't contain his words within the confines of one row. For example, when he opened the cipher with "I like killing people", the letter E is positioned at the beginning of the second row. This randomness is not displayed in the answers to his remaining six unsolved portions of code. The answer to the 18 unsolved characters, the 340 Cipher, the two Fairfield letters, the 13 Symbol Cipher and the 32 Symbol Cipher are all organized and deliberately structured, where every single solution and word is contained within each line - and does not leak from one row to another. Let us take a look at the 13 Symbol Cipher that exhibits symmetry within its design.             

I don't have to explain the above, because its structure and symmetry is there for all to see. The Zodiac Killer had already responded to prompts by Vallejo Police Chief Jack Stiltz to send more details to prove the letter writer and killer were one and the same. The more the Zodiac Killer wrote, not only lessened his time for killing, but may have provided additional clues to detectives regarding his identity. This tactic was likely adopted by Professor D.C.B. Marsh in the October 22nd 1969 San Francisco Examiner newspaper article by Will Stevens, which laid down a challenge to the Zodiac Killer to reveal his name. The newspaper stated Dr Marsh told the Examiner today: "The killer wouldn't dare, as he claimed in letters to the newspapers, to reveal his name in the cipher to established cryptogram experts. He knows, to quote Edgar Allen Poe, that any cipher created by man can be solved by man. Zodiac has not told the truth in his cipher messages to the Examiner, the Chronicle and the Vallejo Times-Herald. Zodiac has not done this, because to tell the complete truth in relation to his name -in cipher code - would lead to his capture. I invite Zodiac to send The American Cryptogram Association a cipher code - however complicated - which will truly and honestly include his name".

The above invitation by Dr. Marsh, quoting Edgar Allen Poe, was met with the 13 Symbol Cipher that mirrored a code used in Poe's A Few Words on Secret Writing. The alphabet being split A to M, and N to Z. The 13 Symbol Cipher began with A and ended with M. So it was logical to place the alphabet alongside the 13 Symbol Cipher and see if any patterns emerged by counting the numerical difference between corresponding characters. This resulted.

I don't want to labor the point again, so for a full explanation please visit the article Embedded Symmetry  Suffice to say, that when the Zodiac's solution or answer to the 13 Symbol Cipher was inserted into the code above, it showed an organized and structured pattern without a word bleeding from one end of the cipher to the other. The Zodiac Killer gave us the cyclical solution of Fk I'm crackproof on October 5th 1970, and followed this up with the line "This is the Zodiac speaking Like I have allways said, I am crack proof" on March 13th 1971. But in the Los Angeles Letter you will notice he separates "crackproof" to "crack proof", exactly how it is found in the 13 Symbol Cipher. It does not bleed from the end of the cipher to the start.

The first 8 begins FK. The second 8 begins IM. The third 8 begins CRACKPROOF. But CRACK and PROOF are separated, without either word being fragmented. The FK and IM also fit nicely around the existing K and M in the cipher. The cipher solution maintains an organized and symmetrical appearance. The introduction on the April 20th 1970 letter now read "This is the Zodiac speaking. By the way have you cracked the last cipher I sent you? My name is Fk, I'm crackproof". He was leading us into the belief these were his initials.

The Paradice and Slaves configuration from the Halloween Card to the 340 Cipher also exhibited form, with Paradice exactly bisecting the columns of the 340 Cipher, and Slaves exactly bisecting the rows of the 340 Cipher in a 17 X 17 pattern. Each word contained within a row or column. The Halloween Card envelope providing us with "sorry no cipher" in a cross formation, not only telling us that the 340 wasn't a standard cipher, but the design of the 340 was to be found in a cross formation.

The 32 Symbol Cipher also adhered to a solution where no word bled from one row to another. The 32 Symbol Cipher contained two rows of 17 and 15 characters - obviously created this way for a purpose. When we discovered that the number 5 was to be inserted into the cipher using the arrow and hashtag, the answer of Radians and 5 inches along the radians again fell perfectly into the 32 Symbol Cipher with no word extending from one line to another. You will notice that when the Zodiac Killer provided us with the answer in the July 26th 1970 Little List Letter, he self-contained the answer on a separate line, with the first Radians beginning with a capital letter. This was the beginning of the code solution.

"PS. The Mt. Diablo Code concerns Radians and # inches along the radians" was in fact Radians and 5 inches along the radians. When this is placed into the 32 Symbol Cipher, you will notice that once again it retains separation, with "inches" ending line one, and "along" beginning line two. Each word is contained within the line. This organization and structure flies in the face of the solved portion of the 408 Cipher and implies a deliberate and calculated design. But we need to take it even further.

Explained in greater detail in the article The Answer to the Z38 Code, the structure of the Zodiac 38 character cipher was pointed out. The code below has been structured with different character counts on each line (unlike the 408 and 340 ciphers), but is instead arranged in a formation of 12 characters on line one, 7 characters on line two, 5 characters on line three, 6 characters on line four and 8 characters on line five. This may suggest that the words are contained separately on each line, without running from one line to another. We would expect Slaves and Paradice to be grouped together - and the last two lines satisfy this character count of 6 and 8. We then have three lines remaining of 12, 7 and 5 characters. By Gun satisfies the 5 characters, By Knife satisfies the 7 characters, and By Fire, By Rope satisfies the 12 characters. This forms the basis of the completed 38 character code solution, mimicking the second Fairfield Letter design and the exact wording on the Halloween Card configuration. Furthermore, no word extends from one line to another, exactly as displayed in the above codes.

So far (including the Tim Holt comic book unearthed by Tahoe27), every single solution or answer to the ciphers can be achieved using the exact words employed by Zodiac from three consecutive communications spanning July 26th 1970 to October 27th 1970. [1] Radians and 5 inches along the radians [2] Fk I'm crackproof [3] Paradise and Slaves, and [4] By Fire, By Gun, By Rope, By Knife, Paradice and Slaves. And none extend or bleed into another line, or from end to beginning in the 13 Symbol Cipher. That is five ciphers down with one to go. 

The Zodiac Killer claimed that his 408 Cipher contained his identity or pseudonym. What was important to the Bay Area murderer was the structure exhibited by all the above codes. The characters he used were of no particular significance, because they weren't designed to be solved without future Zodiac input. This input came towards the end of his letter writing campaign, when he supplied us all the answers in just three consecutive communications. He was effectively wrapping up business. There was no way a man with such an inflated ego and inability to resist writing to the newspapers, could keep the secret to his ciphers for upwards of five decades. The answer to the 408 Cipher was given to us in just four days, contained in the trinity of July 31st 1969 letters and the August 4th 1969 'Debut of Zodiac' Letter. He claimed his identity was in the 408 cipher - and we know his identity was "Zodiac" because he gave us his pseudonym. All we then had to do, was fit Zodiac around the declaration of who he was. 

Initially, the Zodiac Killer had intended to leave 12 characters at the base of the 408 Cipher, but his accidental omission of the word "people" when he encoded his message, inadvertently left him with 18 unsolved characters. However, this was of no consequence - it was an easy adjustment. You will notice again, that the unsolved 18 characters are split into an ungainly 1 and 17 configuration. If we are to hold true to single words not bleeding from one line to another, then the single character must stand for I or A. We know that the Zodiac Killer was an egotist, beginning the 408 Cipher with "I like killing people because it is so much fun". He also began two of the July 31st letters with "I am the killer". So it wouldn't be any great leap of faith to believe that the isolated singular character on line 23 was "I". Coupling the "Zodiac" with "I am the killer" to produce "I am the Zodiac Killer" satisfies his declaration of identity and the 18 characters at the base of the 408 Cipher. We again have used only the words written by the Zodiac Killer - and no word extends from one line to another. The third of code containing his identity was mailed to the San Francisco Chronicle, which is why he began that introduction with "This is the murderer". He was reserving "I am the Zodiac Killer" for the base of the 408 Cipher.  

We now have six unsolved portions of code answered, using only the words written by the Zodiac Killer in a total of four communications. Every single answer was organized and structured to remain within each row, line and column with no manipulation whatsoever. We can wait another 50 years for these codes to be "solved" - or believe they were all answered by October 27th 1970 from the pen of the Zodiac Killer.

Many Zodiac enthusiasts have pondered from where did the Zodiac Killer acquire his pseudonym, or when he decided upon the name Zodiac. The Bay Area murderer arrived at Lake Herman Road on December 20th 1968, where he callously executed David Faraday and Betty Lou Jensen with six shots to the head and body. Just over seven months later, on July 31st 1969, he mailed three pieces of correspondence to the San Francisco Chronicle, San Francisco Examiner and Vallejo Times-Herald, but failed to introduce himself as Zodiac despite having over half a year to formulate a pseudonym. He only introduced himself as the "killer" and "murderer".

Three letters, detailing his crimes and awash with cryptograms, announcing his arrival to the newspapers, seemed like the perfect opportunity to announce those infamous words of "This is the Zodiac speaking" - yet nothing. His next communication was only sent in response to Vallejo Police Chief Jack E. Stiltz, who doubted the letter writer and killer were the same person and "urged the writer yesterday to send more letters with more facts to prove his connection with the crimes". The Bay Area murderer immediately replied on August 4th 1969, stating "This is the Zodiac speaking. In answer to your asking for more details about the good times I have had in Vallejo, I shall be very happy to supply even more material". It can be seen that this letter would never have been sent, had Vallejo Police Chief Jack E. Stiltz not urged the killer to do so. If the letter had not been sent, then our killer would not have presented himself as Zodiac on August 4th 1969. In fact, he may not have adopted the pseudonym at all.

In absence of this letter, the next letter to contain his pseudonym was mailed two days after the Paul Stine murder on October 13th 1969. So, it's entirely plausible that the muderer of five could have begun and ended his attacks in the Bay Area as a nameless killer. The Vallejo News Chronicle published one-third of his 408 Cipher on August 1st 1969, the San Francisco Chronicle did the same on August 2nd 1969, with the San Francisco Examiner waiting until August 3rd 1969 and publishing all three parts, but on a lowly page nine. All three carried the message from Vallejo Police Chief Jack E. Stiltz, yet despite the Examiner publishing their part of the cipher the latest and relegating it further from the front page than the other publications, in defiance of his demands for front page coverage by Friday afternoon, it was the Examiner he chose to introduce his pseudonym to. In other words, they complied the least, but the killer chose to "supply more details" to them rather than a Vallejo publication and to the home city of Vallejo Police Chief Jack E. Stiltz, who he was supposedly addressing.

There is a real possibility that the murderer of three chose the San Francisco Examiner because they were the only publication to give the murderer a pseudonym, which may have ultimately triggered the following communication a day later. The Examiner wrote "The police telephone system was clogged by anxious callers asking if the "cipher killer" had been caught". The murderer seemingly didn't appreciate the pseudonym given to him and a day later, on August 4th 1969, he introduced himself to the Bay Area with "This is the Zodiac speaking". But why this phrase? The Examiner article noted that "the police telephone system was clogged by anxious callers asking if the "cipher killer" had been caught", so what better way to announce yourself as you might do over the telephone. This wasn't an anxious caller, this was the Zodiac speaking.  

Without this San Francisco Examiner article and resultant Debut of Zodiac Letter on August 4th - announcing yourself as the "Zodiac" on October 13th 1969 after the end of a ten month series of murders, certainly wouldn't have had the same impact. Without the publication of "cipher killer", the pseudonym of the Zodiac Killer would in all probability never have existed.

The counter-argument to the above, is the killer had ample time to give himself a pseudonym from December 20th 1968 to July 31st 1969, and only began the trinity of letters with "murderer" and "killer" because he had reserved the pseudonym "Zodiac" for the 18 characters at the foot of the Chronicle cipher. This was the portion he claimed held his "identity". A hidden pseudonym would be negated had he began the correspondence with "This is the Zodiac speaking". With the entirety of his communications beginning with this phrase, does it lend credence to the notion its absence from the introduction to these three letters, is validation to its concealment in the 18 unsolved characters?  If he hadn't preselected his pseudonym in advance of the July 31st 1969 letters, one could revert back to the notion it was the "cipher killer" attribution that triggered his reply on August 4th 1969. For 35 years starting in 1965, the San Francisco Chronicle and Examiner operated under a Joint Operating Agreement whereby the Chronicle published a morning paper and the Examiner published in the afternoon. The Examiner published the Sunday paper's news sections and glossy magazine, and the Chronicle contributed the features. Circulation was approximately 100,000 on weekdays and 500,000 on Sundays. By 1995, discussion was already brewing in print media about the possible shuttering of the Examiner due to low circulation and an extremely disadvantageous revenue sharing agreement for the Chronicle. Wikipedia. The Bay Area murderer's reply on August 4th, including his pseudonym for the first time, would therefore have been formulated in the mind of the killer from the moment he read the Sunday Examiner publication to his creation of the letter. The Zodiac Killer being born on August 3rd 1969, or early Monday morning on the fourth.
   

However, if he had decided upon his pseudonym in advance of the July 31st 1969 letters and had consciously withheld his pseudonym from his introduction so as to place it within the 18 unsolved characters - then having failed to do so - would be counterintuitive. One could argue that his use of the words "killer" and "murderer" were chosen for purpose, thereby lending credence to a viable solution with respect to the 18 unsolved characters. 

The 18 unsolved characters (if they contain any meaning whatsoever) clearly operate under a different technique of decryption to the other 390 characters. So if the Zodiac Killer didn't happen upon his pseudonym on August 3rd or 4th, then we have the very real possibility that the identity of "Zodiac" does reside in these final 18 characters, to which he alluded to in his address to Vallejo Police Chief Jack E. Stiltz on August 4th 1969. The Zodiac Killer stated "when they do crack it, they will have me".

The Zodiac Killer committed the senseless slayings of David Faraday and Betty Lou Jensen on December 20th 1968. Six and a half months later he would follow this up with a second attempted double murder at Blue Rock Springs Park on July 4th 1969, in which sadly, Darlene Ferrin would succumb to her devastating injuries. Approximately one month later, the Zodiac Killer mailed three letters to the San Francisco Chronicle, San Francisco Examiner and Vallejo Times-Herald announcing that he was responsible for the three murders and attempted murder, while challenging authorities to decode a 408 character cipher. The Zodiac Killer threatened the newspapers, stating "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".  Imagine his horror when the two main newspapers failed to bow to his threats, with the San Francisco Chronicle placing the story on page 4 of the August 2nd 1969 edition, and the San Francisco Examiner demoting him to a lowly page 9 on August 3rd 1969. The problem was further compounded, with Vallejo Police Chief Jack E. Stiltz even questioning the validity of the author and "urged the writer to send more letters, with more facts to prove his connections to the crimes."

The Zodiac Killer in his haste to prove he was the killer responsible for three people, immediately sent a letter to the San Francisco Examiner on August 4th 1969 - and despite the Examiner printing his letter the same day, in which he declared "This is the Zodiac Speaking" and that he "was not happy to see that he did not get front page coverage", imagine his utter disbelief when he discovered that the San Francisco Examiner had again relegated his letter supplying more details of the crimes to page 4. It equally wouldn't have escaped his attention, that on the front page of the same paper it featured the double knife slaying of two young girls from San Jose. Deborah Furlong (14) and Kathy Snoozy (15) had been brutally stabbed while picnicking on a grassy knoll on August 3rd 1969. The Zodiac Killer had now murdered three people, nearly killed Michael Mageau and sent four communications (including three cryptograms), yet he was still unable to command front page coverage. But now he knew exactly what was required - and it was staring him squarely in the face on page one. August 4th 1969 was not only the day he announced his pseudonym to the world, but the day he realized that a brutal stabbing was required to secure himself front page coverage. This was the day the fate of Bryan Hartnell and Cecelia Shepard would be sealed, almost two months in the making.   

Forever the narcissist, the Zodiac Killer couldn't believe his luck when he happened upon three young girls on the shores of Lake Berrryessa by Smittle Creek. I am sure for a brief moment he could see the headlines flash in front of his eyes: "3 Girls Stabbed, Sunbathing Murders, Footprint Clue". However, the Zodiac Killer for whatever reason, decided against the attack, returned to his vehicle and drove away. Fortunately, the three young women from Pacific Union College would escape the wrath of the Zodiac Killer - but he was not done yet. Approximately two hours later and eight tenths of a mile south, the Zodiac Killer would reappear and set his sights on the 1956 White Karmann Ghia of Bryan Hartnell and Cecelia Shepard, before traversing the 510 yard hillside descent to the area of the picnicking couple. Driven by an insatiable desire to secure front page coverage, he proceeded to callously stab the young couple sixteen times before finally returning up the hillside and out of sight. The thoughts of the San Jose murders of Deborah Furlong and Kathy Snoozy - and the headline news they generated - were probably in the forefront of his mind when he approached the Volkswagen Karmann Ghia and pulled the black marker pen from his pocket. He proceeded to write on the car door of Bryan Hartnell's vehicle, to leave you in no doubt that he was mimicking the murders of the two young girls from San Jose. He wrote "Vallejo 12-20-68, 7-4-69, Sept 27-69 - 6:30 by knife". If you ever wondered why he wrote the time 6:30 on the car door, even though he rang in the crime just seventy minutes later, then the newspaper article below may give you a clue. This is the article from the San Francisco Examiner on August 4th 1969 - the very reason why the Zodiac Killer arrived at Lake Berryessa on September 27th 1969 in the first place.  

This annotation of 6:30 on the car door of Bryan Hartnell's vehicle was supposed to mark the time that the young couple at Lake Berryessa failed to return home also.

We know the Zodiac Killer was an avid reader of the newspapers, often replying to law enforcement officers such as Vallejo Police Chief Jack E. Stiltz and Captain Martin Lee, as well as arbitrary content from the newspaper articles themselves. Therefore, would it be any great surprise if he found his pseudonym in the newspapers as well. Covered very briefly on Zodiac Killer Mystery forum and Tom Voigt's old message board, this finding deserved another showing. The Zodiac Killer and the influence of astrology has been widely covered throughout the years, but below we have a column that featured daily over several decades in many newspapers, including the Vallejo Times-Herald throughout the relevant time period of the Lake Herman Road and Blue Rock Springs attacks. The Star Gazer astrology column was created by Clay R. Pollan and ran in over 400 newspapers. He was a newspaper editor and publisher for many years, and founded the Inter-American Features Syndicate in the mid 1940s which distributed Star Gazer and Scram-lets puzzles.

The columns began with "To develop the message for (day), read words corresponding to numbers of your Zodiac birth sign". We mention the Zodiac Killer crosshairs being found in conjunction with the word "Zodiac" on a watch, but here we have a column that would have featured in the Vallejo Times-Herald in 1969, that contained a hidden message within the Zodiac horoscope - and on July 31st 1969, the Zodiac Killer mailed a hidden message in three portions of code, one of which was sent to the Vallejo Times-Herald, and one which was mailed to the San Francisco Chronicle, in which he wrote "In this cipher is my idenity". Is it conceivable that the inspiration for his pseudonym was derived from this Zodiac horoscope, which further inspired him to begin his letter writing campaign with a concealed message?  

Twenty-one years later, could the Zodiac Killer have returned and used the very same technique, when he mailed the Celebrity Cypher. Luis Campos, born in Santiago, Dominican Republic is an inventor, poet and cryptographer who created puzzles and ciphers for the United Features Syndicate of New York, beginning in 1983. He would create six celebrity ciphers a week, featuring famous quotes from well-known people, past and present. The reader had to identify the person and quote from the encoded text. The characters in the cryptograms were deliberately spaced into separate words, as shown below.  

On September 25th 1990, somebody mailed the Celebrity Cypher to the Vallejo Times-Herald, approximately three months before the 1990 'Eureka' card - often associated with the Zodiac Killer. Bearing in mind the 408 cipher mailed to the San Francisco Chronicle, San Francisco Examiner and Vallejo Times-Herald on July 31st 1969, many have pondered whether this postcard was mailed by the Bay Area murderer.

We may now have two sets of Zodiac communications inspired by the hidden messages of Clay R. Pollan and Luis Campos, with the Vallejo Times-Herald the common denominator in both instances. We know the Zodiac Killer derived inspiration from the newspapers, but did this inspiration extend to mimicking the art of hidden messaging? This concept could have extended even further, when the Zodiac Killer designed his infamous unsolved 340 cipher, that may have been taken straight from the Dick Tracy comic and breakfast cereals of children - again receiving widespread publicity in the newspapers. See the Dick Tracy 340 Cipher article. 

The circumstances of a payphone call 40 minutes after the Blue Rock Springs attack, being made from a location only 10 minutes journey time from the crime scene, has generated the idea of a killer who lived extremely close to the Springs and Tuolumne intersection in Vallejo. The over-detailed description of a negro-male eyewitness, generously offered by the author in his August 4th 1969 communication, appeared to corroborate that the murderer was making the phone call accompanied by his car, His unnecessary use of phraseology such as "when I hung the phone up the damn thing began to ring & that drew his attention to me + my car", can be construed as a man attempting to sell us the idea that he was not on foot. This formulated the notion of a ruthless killer who separated himself from his vehicle, weapon and clothing, before making the risky phone call so near to the Vallejo Police Department. He also admitted to hearing the 'trace' on the payphone, indicating that he was still within earshot of the payphone when it rang. This is important, because if the ring-back hadn't occurred within approximately 20 seconds, he would have been long gone in his vehicle. 

There is also a distinct possibility the slayer of Darlene Ferrin had blood transfer on his t-shirt, as he leaned over the passenger side seat of the 1963 brown Corvair in order to shoot Michael Mageau as he took refuge in the rear of the vehicle. Michael Mageau later described a heavyset man of 26-30 years, standing at about 5'8'' tall, beefy build, but not blubbery fat, possibly 195-200 pounds, short curly light brown hair, almost blond. He stated the assailant's vehicle was similar to Darlene's brown Corvair, possibly lighter in color. The accuracy of these statements must be seen in context to the very brief time he was given to view the subject. Nevertheless, these were his recollections documented in the police report. 

Nearly one month after the attack on July 31st 1969, three letters were mailed to the San Francisco Chronicle, San Francisco Examiner and Vallejo Times-Herald threatening more murder and mayhem. Speculation inevitably arose after the Blue Rock Springs attack, as to whether Darlene Ferrin was specifically targeted by the killer, after three further suspicious phone calls were received in the early morning hours of July 5th. Much has been discussed regarding these phone calls, received at the 1300 Virginia Street residence of Darlene Ferrin, and the 930 Monterey Street residence of Mr Arthur J Ferrin and Mrs Mildred Ferrin at approximately 01:30 am, just one and a half hours after the murder of Darlene Ferrin and attempted murder of Michael Mageau at Blue Rock Springs.

Using the descriptors above, I went in search of a young male, heavyset, brownish hair, around 5'8", driving a vehicle similar or the same as the brown Corvair of Darlene Ferrin. This subject must also have had the ability to drive from Blue Rock Springs to a residence close to the payphone, so he could ditch his vehicle, weapon and clothing, and still walk to the payphone by 12:40 am and place the call to police dispatcher Nancy Slover. The murderer issued the message "I want to report a double murder. If you will go one mile east...... on Columbus Parkway to the public park, you will find the kids in a brown car. They were shot with a 9 mm Luger. I also killed those kids last year.... Good-bye". The wording of the killer gave the impression that he was unaware of the crime having already been discovered. Was he a resident close to the Vallejo Police Department and had not heard or seen the 'surge' of patrol cars heading along Solano Avenue to Springs Road?- which didn't happen. The answer to all the above observations already lay on page 42 of the Blue Rock Springs police report.  

Page 42: At 12:55 pm on 9-9-69 an anonymous letter was received at Vallejo PD stating "Badly rusted beat up Corvair getting a bright green paint job at 909 Georgia. Owner about 25, 5'9", over 200 lbs, brownish thinning hair, sloppy fat, strange acting. Lives with parents. Calif BTU 179". Sgt Kramer observed this car parked in the Mobile Station at the corner of Georgia and Monterey Streets, BTU 179. Car has maroon (brownish red) top, light green hood and dark green panels. Car is 1963 Corvair 2-door. Checked the registration of the car and it reflects that Patrick, 909 Georgia Street. Went to that address and contacted Patrick Dennis, WMA, 23 years, dob 3-19-46. Is employed as a stevedore at Port Chicago.

Patrick states that on 7-4-69 he went to the fireworks display at the waterfront and from there he went home. States that he parked his car in front of the house at 11:30 pm and did not leave after that time. Patrick's mother Delores was present and verified Patrick's statement. Patrick doesn't own a gun and he did not know Darlene Ferrin. Patrick states that the car can be started without a key but he is sure no one else used the car as it was in the same place in the morning as it was the night before. This car apparently has a bad oil leak as the street in front of the house showed oil on the pavement as though the car was leaking oil.

The similarities are likely unconnected, but 909 Georgia Street is the type of residence we should be looking for - if you buy into the notion of a killer walking to the payphone that morning. An approximate 10 minute drive home, 10 minutes to ditch the vehicle, weapon and clothes, before readying onself for the 15-20 minute journey to the payphone and placing the 12:40 am call to Nancy Slover. And... in a location to have not seen or heard the patrol cars leaving the Vallejo Police Department up Solano Avenue. This location (as the crow flies) is 400 meters from the Vallejo Police Department, 600 meters from Darlene Ferrin's residence, 400 meters from Solano Avenue, 500 meters from the old Vallejo Times-Herald office and 5/8 of a mile from the Springs and Tuolumne payphone. However, if the August 4th 1969 letter wasn't selling us one big red herring, then all of the above is superfluous.  

It is no coincidence that the Zodiac Killer only wrote "in this cipher is my idenity" in the letter he mailed to the San Francisco Chronicle on July 31st 1969, because this one-third of the cipher contained the 18 unsolved characters at its foot. This was also the only letter of the three to begin with "This is the murderer". The other two communications to the San Francisco Examiner and Vallejo Times-Herald began with "I am the killer". This shift in introduction may be completely accidental, may be subconscious or may be completely deliberate on account of the "identity" he is to place at the foot of the cipher. The author of these three communications had deliberately separated them into three parts, and therefore when he was preparing the San Francisco Chronicle letter, one would like to think he was considering the opening line when placing his identity at the end of the cipher. If he was ever going to disclose his identity (but not his name), then logically it would be an extension of "I am the killer" to "I am the Zodiac Killer", and therefore satisfy the quota of 18 unsolved characters required by the cipher. I have inserted "I am the Zodiac Killer" at the end of the opening lines of the San Francisco Chronicle and San Francisco Examiner to show how the revelation of his identity in the Chronicle better suits the introduction of "This is the murderer". 
San Francisco Chronicle: "Dear Editor, This is the murderer of the 2 teenagers last Christmass at Lake Herman + the girl on the 4th of July near the golf course in Vallejo. I am the Zodiac Killer" 
San Francisco Examiner: Dear Editor, I am the killer of the 2 teen-agers last Christmass at Lake Herman and the Girl last 4th of July. I am the Zodiac Killer"     

The Zodiac Killer may have accidentally dropped the word "people" from the San Francisco Chronicle cipher (shown in red above) when he transitioned from one cipher to another, unwittingly missing out this word from his original draft to final version, and thereby forcing him to switch from the intended 12 characters he meant to leave, to a revised 18 characters.To rectify his mistake he simply changed "I am the Zodiac" to "I am the Zodiac Killer". The confirmed murderer of five never used the term "Zodiac Killer" in any of his subsequent communications, opting for "This is the Zodiac speaking", but may have had his hand forced on this occasion. It would have been relatively easy to just rewrite the San Francisco Chronicle cipher, but this was an easy solution. One can see how the Zodiac Killer chose his words in the October 13th 1969 letter, opening up with "This is the Zodiac speaking. I am the murderer of the taxi driver over by Washington St + Maple St last night". He uses the words "I am" because he has already introduced himself as the Zodiac. In the July 31st 1969 San Francisco Chronicle letter he uses the words "This is the murderer" because he has thus far failed to introduce himself, which he reserves for the final line of the cipher, stating "I am the Zodiac (Killer)". It is effectively a reversal of the Paul Stine letter. 
Paul Stine letter: "This is the Zodiac speaking. I am the murderer of the taxi driver".  
San Francisco Chronicle: "This is the murderer of the 2 teenagers. I am the Zodiac Killer"    

The murderer would very quickly introduce himself in the August 4th 1969 'Debut of Zodiac' letter: "This is the Zodiac speaking. In answer to your asking for more details about the good times I have had in Vallejo, I shall be very happy to supply even more material. By the way, are the police having a good time with the code? If not, tell them to cheer up; when they do crack it, they will have me". He was introducing himself as "Zodiac", so when the police did eventually crack the code, in effect, they would have "had Zodiac". 

An anonymous caller in San Francisco declared that whoever devised the code "would have to have a vast knowledge in three fields - surveying, nautical science and marksmanship". How the caller could derive that the triple murderer had a vast knowledge of marksmanship from these attacks is hard to justify, not to mention nautical science and surveying. Was the Zodiac Killer ringing the police and blowing his own trumpet? The murderer did ultimately commit his murders with varied weaponry and did eventually introduce a map and radians into his communications.   

If we are looking for an identity or pseudonym in the 18 unsolved characters of the 408 cipher, then it must include appropriate word usage in order to increase the originally intended 12 characters up to 18 characters. So if the original message was "I am the Zodiac" or "Zodiac Killer", then the author had to supplement it with an extra 6 characters to replace the word "people". The simplest avenue available was to add "Killer" or "I am the", in order to generate these 6 characters. These were all used consecutively in two of the three communications mailed on July 31st 1969, when the Zodiac Killer wrote "I am the killer of the 2 teenagers last Christmass at Lake Herman + the girl last 4th of July" to the San Francisco Examiner and Vallejo Times-Herald.  

The Zodiac Killer had seemingly failed to fully convince Vallejo Police Chief Jack E Stiltz, who was less than satisfied that the letter writer and killer were one and the same, urging the author of the July 31st 1969 letters to send in more details of the crimes. The Zodiac Killer immediately dispatched the 'Debut of Zodiac' letter on August 4th 1969 with the introduction of "This is the Zodiac speaking". Although the Zodiac Killer could add more details of the crimes in this new letter to prove he was the killer, It is conceivable he revealed his pseudonym after only four days to inextricably link himself to the first three letters. The only way he could achieve this beyond any doubt, was to reveal a significant word in the unsolved cipher. Then the police would know for certain when the code was broken, that the author of the August 4th 1969 letter was not only the killer, but the designer of the cryptogram. So he introduced his pseudonym "Zodiac" earlier than he had originally intended and immediately rushed it off to the San Francisco Examiner newspaper on August 4th 1969, before the cryptogram was solved.

​Remember, if Vallejo Police Chief Jack E. Stiltz had not urged the author of the July 31st 1969 letters to send in more details to prove the letter writer was the killer, the 'Debut of Zodiac' letter would likely never have been written and sent to the Examiner. The "Zodiac" would still have been the "killer" by the time of the Paul Stine murder. He revealed his pseudonym to link himself to the San Francisco Chronicle's 18 characters, but unfortunately for him, he clearly underestimated the difficulty of the encryption. The release of his identity or pseudonym "Zodiac" so quickly, may lend credence to its presence in the remainder of the 408 cipher, and by extension, the 18 unsolved characters harboring a genuine and coherent message. 

​"This is the Zodiac speaking. By the way, are the police having a good time with the code? If not, tell them to cheer up; when they do crack it, they will have me".

THE 18 UNSOLVED CHARACTERS [PT1]
THE 18 UNSOLVED CHARACTERS [PT2]
​THE 18 UNSOLVED CHARACTERS [PT3]

The Debut of Zodiac letter was received by the San Francisco Examiner newspaper on August 4th 1969 and immediately turned it over to the Vallejo Police Department for comparison to previous Zodiac correspondence. The FBI files above constantly referred to the July 31st 1969 trinity of letters and envelopes, but there was a notable absence of the word "envelope" when referring to the August 4th 1969 communication, and more importantly, on the day it was received. The FBI files explicitly state that the correspondence was "undated" and sent "anonymously". In the absence of any dated or postmarked envelope, this strongly indicates that the three-page letter was hand delivered by the killer to the offices of the San Francisco Examiner at Third and Market Streets.

The Zodiac Killer painstakingly detailed his first two crimes in the July 31st letters "stating some facts which only I + the police know", so must have been aghast at the statement of Vallejo Police Chief Jack E Stiltz in the Sunday August 3rd 1969 San Francisco Examiner & Chronicle, wanting more facts to prove the letter writer was the killer. This may explain his eagerness in rushing off his three-page letter to the San Francisco Examiner. He may have considered posting it in a public mailbox, but his apparent desire to back up his claims in the July 31st letters and have it published in the Examiner by Monday afternoon, forced him to opt for the direct route of hand-delivery. 

For 35 years starting in 1965, the San Francisco Chronicle and Examiner operated under a Joint Operating Agreement whereby the Chronicle published a morning paper and the Examiner published in the afternoon. The Examiner published the Sunday paper's news sections and glossy magazine, and the Chronicle contributed the features. Circulation was approximately 100,000 on weekdays and 500,000 on Sundays. Wikipedia.

Below, the Vallejo News Chronicle details the Zodiac Killer's fourth letter to the San Francisco Examiner on Monday August 4th 1969,        

The noticeable absence of the word "envelope" is not the only reason for believing the Debut of Zodiac letter was hand-delivered, when we look at the layout of the 3rd page where the Zodiac Killer writes "NO ADDRESS". Why on earth would the sender feel the need to write "no address" at the foot of the letter? Probably because there was no envelope containing the address of the San Francisco Examiner.   

The scale on the left is slightly cut off, but the 3rd page measures approximately 10 inches in length.

If the Zodiac Killer had placed all three pages together, placing the 3rd page facing outwards on the top or bottom, then by folding the letters in the middle twice, the face of his communication would measure approximately 2.5 inches in height. The highlighted pink section would be the visible part of his communication, and where the address of the newspaper should have been written. But because he delivered it directly to the San Francisco offices, there was no need for an address - which is exactly what he wrote.

Does the hand-delivery of this letter tell us anything else about the Zodiac Killer, other than his eagerness for publication? The following is speculative and must be regarded as such.

The Zodiac letters have been heavily dissected to discover the likely home residence of the Bay Area murderer, and so we shall attempt to make some observations regarding this communication.


How prepared would the Zodiac Killer be, to travel a long distance just to hand-deliver this letter, rather than mail it? If the Zodiac Killer lived or worked in San Francisco, then it isn't a problem to deliver it in person, either by making the journey specifically or en route to his workplace. However, if he lived in an outlying area (but didn't work in San Francisco) such as Napa (44 miles), Sacramento (94 miles), Santa Rosa (57 miles), Vallejo (29 miles), Oakland (9 miles), then how likely would it be for a person to travel these distances for no other purpose than the desire to hand-deliver a letter?  Surely, based on the 'least effort principle' of geographic profiling, the further away he lives, the less likely this would be the case   

This may suggest that the killer either lived and worked in San Francisco, or lived in one of these other regions and traveled into San Francisco for his profession. If he lived in Napa, for example, would he travel 44 miles (88 miles round trip) for the sole purpose of dropping off a letter, rather than mail it in Napa or somewhere close by? Unless, he lived in Napa and worked in San Francisco.

If the August 4th 1969 Debut of Zodiac letter was personally delivered by the murderer to the San Francisco Examiner, does it in some small way reveal something about Zodiac Killer and his likely residence, or is "no address" the likely outcome?    

In a previous article it was considered that the Zodiac Killer's identity was born on August 3rd 1969, but on this occasion I shall take an altogether different approach, and consider the possibility that the Bay Area murderer had already decided upon the pseudonym Zodiac when he mailed the trinity of letters and ciphers to the Vallejo Times-Herald, San Francisco Examiner and San Francisco Chronicle on July 31st 1969.
The San Francisco Chronicle letter (part 3) reads as follows "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 final 18 characters of the San Francisco Chronicle code remain undeciphered. However, the clues to breaking the remaining portion of the cipher may reside within the letters themselves. 
The 408 cipher message read "I like killing people because it is so much fun it is more fun than killing wild game in the forrest because man is the most dangerous animal of all to kill something gives me the most thrilling experence it is even better than getting your rocks off with a girl the best part of it is that when I die I will be reborn in paradice and all the (people) I have killed will become my slaves I will not give you my name because you will try to slow down or stop my collecting of slaves for my afterlife. ebeorietemethhpiti."  The unbroken characters are shown in red.     

The murderer chose his words carefully, stating "in this cipher is my identity" rather than his name. This became evident when the vast majority of the 408 cipher was cracked a matter of days later, and the killer revealed "I will not give you my name because you will try to slow down or stop my collecting of slaves for my afterlife." This still left open the possibility that his identity or pseudonym was contained in the 408 cipher. The San Francisco Chronicle letter was the only one of the trinity that contained "in this cipher is my identity," so logically, one could conclude that the 18 undeciphered characters at its foot, was the location of the murderer's identity.
If the killer had already decided upon his pseudonym when he wrote the three July 31st 1969 letters, then his decision to begin all three letters with "This is the murderer" and "I am the killer" (twice) was deliberately engineered to withhold the pseudonym Zodiac from the letters. The reason being - it was concealed in the final 18 characters of the 408 cipher.
It could be argued, that if he was to reveal his identity or pseudonym in the 408 cipher, then logically he would sign off the cryptogram with it. This was also apparent in the 340 cipher, with the near-Zodiac tantalizingly placed on the final line. 
If the Zodiac Killer had revealed his pseudonym straight away, then one of the letters would have opened with "This is the Zodiac" rather than "This is the murderer" (exactly like the August 4th 1969 letter). The other two letters would have opened with "I am the Zodiac Killer" rather than "I am the killer". But the murderer and author of the letters wanted to hide his pseudonym for now, and conceal it in the final 18 characters of the 408 cipher.    

We can now complete the 408 message:
"I like killing people because it is so much fun it is more fun than killing wild game in the forrest because man is the most dangerous animal of all to kill something gives me the most thrilling experence it is even better than getting your rocks off with a girl the best part of it is that when I die I will be reborn in paradice and all the (people) I have killed will become my slaves. I will not give you my name because you will try to slow down or stop my collecting of slaves for my afterlife. I am the Zodiac Killer."​
This is an attempt at reasoning a solution from within the letters themselves, and not a claim of a definitive solution 

THE 18 UNSOLVED CHARACTERS [PT2]
THE 18 UNSOLVED CHARACTERS [PT3]

Officer Richard Hoffman arrived at the Blue Rock Springs parking lot at approximately 12:13 am on July 5th 1969. Shortly thereafter, an ambulance was summoned (arriving at around 12.20 am) and removed the victims from the crime scene for the 10 minute journey to Kaiser Hospital, where Darlene Ferrin was pronounced dead upon arrival at 12:38 am. Here is an extract from page 7 of the police report:

'On initial arrival, RO requested by radio an ambulance & an investigation at the scene & upon returning to Officer Hoffman RO went to assistance of subject on ground, as Officer Hoffman was with a subject that was sitting on left front seat behind wheel that was also injured. This subject later identified as Darlene E. Ferrin, WF, 19, of 864 Beechwood. On preliminary examination of Mageau, it was apparent he had been shot a number of times, he had blood all over his face & blood coming from his mouth as well as his left leg with blood. RO felt it was necessary to question subject inspight of the fact the subject was in great pain. Subject was coherent & RO asked him, "do you know who shot you?" and he replied "no". RO then asked Mageau to give me some type of description & he replied that he can't. RO then asked a series of questions & was told by Mageau that the responsible was a white male, young & heavyset by himself & that he was in a brown vehicle. Questioning continued until the arrival of the ambulance. By this time Sgt's Rust, Lynch and Odiorne had arrived at the scene & RO gave them the information from the victim & gave a description over the air to all units' 

Michael Mageau also told Officer Hoffman that the perpetrator was last seen heading in the direction of Springs Road and Vallejo. By 12:20 am a rudimentary description of the perpetrator, his vehicle, and direction of travel had been given to all units, who likely scoured the area of Springs Road towards Vallejo. The killer couldn't be certain his vehicle wasn't spotted leaving the Blue Rock Springs parking lot and couldn't be certain that both Darlene Ferrin and Michael Mageau were dead, despite his proclamation in the 12:40 am payphone call to police dispatcher Nancy Slover. With multiple units searching for a description of the vehicle, how likely is it that the Zodiac Killer immediately traveled to the payphone, parked his car outside Joe's Union gas station and made a telephone call to the operator and Vallejo Police Department - a police station situated in extremely close proximity to the payphone. He may have been under the impression that his crime had not been discovered at this juncture, but would it have been the sensible option to remain in his vehicle, with possibly blood transfer on his clothing and the gun still in his possession. If the killer did not have a residence nearby, then he had either driven around or parked up somewhere from midnight to 12.40 am - all while a police search of the area is unfolding around him. There is, however, a new and compelling argument to be had that may dispel the idea of a killer making a payphone call while in the presence of his vehicle - and can be found in the police report and August 4th 1969 'Debut of Zodiac' letter.  

This is an extract from page 13 of the police report:
'7-5-69 A call received at 12.40 AM by unknown citizen "I want to report a double murder. If you will go 1 mile east on Columbus Parkway to the public park, you will find the kids in a brown car. They were shot with a 9 mm Luger. I also killed those kids last year. Good-Bye" 

'12.47 AM Mrs Johnson PT&T operator called. The above call was traced to a coin-operated telephone at Joe's Union, Tuolumne and Springs Road. The call was traced by Betty MAIN whose supervisor would not allow her to give a statement at this time.' 

This is the recollection of Nancy Slover in the 2007 Zodiac documentary, describing the latter part of the telephone call: 'But he said something like goodbye (drawn out in nature) and he hangs up, and I'm just kind of sitting there thinking "Oh my God."' 

Here is part of Zodiac's August 4th 1969 'Debut' letter:
'The man who told police that my car was brown was a negro about 40-45 rather shabbly dressed. I was in this phone booth having some fun with the Vallejo cop when he was walking by. When I hung the phone up the damn thing began to ring & that drew his attention to me + my car.'

These four sections of text should be enough to pour huge doubt on a killer making a telephone call to police, having driven to the payphone in a "brown car", further bolstering the idea of a killer on foot who lived nearby. The Zodiac Killer, in his own words, places his vehicle right next to the payphone. He corroborates this using the 'negro male', who spotted him and his vehicle when the phone rang as he hung it up. If the Zodiac Killer is in his vehicle as he claimed, it is highly doubtful that once he replaced the receiver he perched himself alongside his vehicle and smoked a cigarette for several minutes with an eyewitness clocking him and his vehicle. He would have "hung the phone up," returned to his vehicle immediately and driven away. This sequence of events couldn't have taken much longer than 10 seconds.

Police dispatcher Nancy Slover, once the Zodiac Killer had hung up, contemplated the gravity of what she had just heard, likely finishing off writing details of the call, "kind of sitting there thinking "Oh my God." She then had to reconnect to the operator to discover the origin of the call - who would then have traced the call to Joe's Union on Springs and Tuolumne. 'Ringback' would have been used to 'dial' back to this payphone, thereby making it ring. Unless this sequence of events could be accomplished in less than 10 seconds using the technology of 1969, the Zodiac Killer would never have heard the phone ringing. He would have returned to his vehicle and been long gone. The ringing payphone was never reported in any newspapers, so the Zodiac Killer had to be within audible range to know of this occurrence. Nancy Slover received the phone call at 12.40 am, and the Zodiac spoke for approximately 30 seconds. The call would surely have ended before 12.41 am, yet, Mrs Johnson (PT&T operator) didn't get back to police, stating the call had been traced, until 12.47 am. That is just over 6 minutes later. If the trace and 'ringback' had occurred almost immediately (in under 10 seconds), why, bearing in mind the gravity of the murderous phone call, did it take 6 minutes to relay this crucial information to police.   

If the PT&T operator had contacted police the moment they had traced the phone call (12.47 am), then this operation would have taken several minutes. If this were the case, then the Zodiac Killer could never have heard the phone ring if he had driven away in his vehicle. If Joe's Union payphone had been rung in a reasonable estimate time of 30-60 seconds by PT&T operators - once Zodiac had hung up - he still wouldn't have failed to reach his vehicle and driven away. However, it is certainly possible he could have heard the payphone ring if he was on foot while walking away towards his residence. He would still be within audible range.

The Zodiac Killer would have rang the operator that morning and asked for the Vallejo Police Department - hence their ability to 'trace' the call. But, once the Zodiac Killer had 'hung the phone up', is it possible that Nancy Slover could finish up her written record of the call, sit there briefly, thinking "Oh my God," contact the PT&T operator, who then facilitated a trace on the call and rang the Joe's Union payphone inside of the time it takes for Zodiac to reach his vehicle and drive away. If the 'ringback' took as little as 30-60 seconds, then it's highly likely the Zodiac Killer heard the payphone ring as he was walking away from the Springs Road and Tuolumne Street intersection on his way home. The 40-45, rather shabbily dressed, negro male now becomes the perfectly described eyewitness, who saw Zodiac in his "brown car by the payphone." What a helpful guy.
 

Many have toyed with the idea of a Zodiac Killer in Riverside, California, responsible for the murder of Cheri Jo Bates on October 30th 1966 or at the very least the author of the Confession and Bates letters. There are tantalizing threads in regards to the three Bates letters allying with his 'trinity' of communications mailed to the Vallejo Times-Herald, San Francisco Chronicle and San Francisco Examiner on July 31st 1969, just over two years later. The double postage was evident, and the threat of "more victims" was apparent in both. The April 30th 1967 Bates letters stated "Bates had to die, there will be more". The Vallejo Times-Herald communication carried a similar threat: "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". It is also pointed out that the Zodiac Killer was responsible for the Bates letters because he signed off two of the letters with a Z-like alphabetical character - the Z representing Zodiac. The following will cast some doubt on this supposition and hopefully give us the exact date the Zodiac Killer first thought up his pseudonym Zodiac. In other words, the pseudonym Zodiac didn't exist for this individual in 1967 and therefore the alphabetical Z wasn't representative of Zodiac, or the precursor to it.​ 

On the right is an excerpt from the San Francisco Sunday Examiner and Chronicle dated August 3rd 1969. The Vallejo Police Chief Jack E. Stiltz "urged the writer yesterday to send more letters with more facts to prove his connections with the crimes". The Bay Area murderer duly obliged with the 'Debut of Zodiac' letter, received by the San Francisco Examiner on August 4th 1969. It was called the "Debut" letter for good reason - it was the day the Bay Area murderer revealed his pseudonym to the world, opening with the now infamous line "This is the Zodiac speaking". But if Chief Jack E. Stiltz had not requested more details, it is extremely unlikely this correspondence would have been mailed at all. We would have had to wait over two months until the October 13th 1969 Paul Stine letter for Zodiac to introduce his pseudonym into the public domain, if ever at all. 

The 'Debut of Zodiac' letter only existed because of Chief Jack E. Stiltz - and this communication is the only reason our knowledge of the killer as Zodiac existed at this point in time. The choice of the pseudonym being revealed in this letter was not a choice made by the killer, because he wouldn't have written it, if not pressed into action by reading this newspaper column. In fact, the Zodiac Killer may never have existed under this name, if it wasn't for this publication by the San Francisco Sunday Examiner and Chronicle on August 3rd 1969. There is further evidence that the American public played a key role in igniting the killer's choice of pseudonym.

If the Z on the Bates letters really stood for Zodiac, then the murderer of Cheri Jo Bates, David Faraday, Betty Lou Jensen and Darlene Ferrin had almost three years to create an appropriate pseudonym before the July 31st 1969 'trinity' of communications proclaiming his collection of slaves for the afterlife. He had six and a half months from the December 20th 1968 double murder until the attack at Blue Rock Springs Park. He had 27 days from the July 4th 1969 attack until the mailing of the July 31st 1969 'trinity.'.  This was his arrival to the world, yet he didn't sign off any of these letters with 'Zodiac' or even a 'Z'.

If he was surreptitiously operating under the name of Zodiac at this point, he clearly didn't give this impression when he opened up two of his communications with the rather unoriginal opening line of "I am the killer of the 2 teen-agers last Christmass at Lake Herman and the Girl last 4th of July" to the Vallejo Times-Herald and San Francisco Examiner. The San Francisco Chronicle was equally devoid of any pseudonym or initial, beginning with "This is the murderer of the 2 teenagers last Christmass at Lake Herman + the girl on the 4th of July near the golf course in Vallejo".  The reason behind this, being that he hadn't formulated the pseudonym Zodiac at this juncture. The prompt was to come just three days later on Sunday August 3rd 1969- the day the 'Zodiac Killer' was born in the mind of the killer. 

The San Francisco Sunday Examiner and Chronicle opened with the lines "A self-accused killer failed to keep a threat of mass murder here, but there was no slackening of tension or mystery caused by the warning. The police department telephone system was clogged at times by anxious callers asking if the "cipher killer" had been caught". The killer likely read this publication and was probably dismayed at the pseudonym of "cipher killer" attributed to him. He sat back in his armchair and was likely sparked into action to create his own pseudonym. He thumbed through the San Francisco Sunday Examiner and Chronicle of August 3rd 1969 during the day, until he arrived at the Zodiac horoscope page, and a light went on. This was the day the 'Zodiac Killer' was born.