Some of the questioned Zodiac communications address certain individuals using the lower case format, and the March 13th 1971 'Los Angeles' letter refers to Riverside in the same fashion: "I do have to give them credit for stumbling across my riverside activity, but they are only finding the easy ones, there are a hell of a lot more down there". The Riverside Desktop Poem, written sometime in 1966 and believed to have been signed off with the author's initials, also featured two lower case letters. The clue to "rh" may lie in the poem itself and in the first correspondence by the Zodiac Killer on July 31st 1969 - assuming you believe a connection between Riverside and the Bay Area murders. That is because there is a real possibility the Riverside Desktop Poem was authored prior to the murder of Cheri Jo Bates on October 30th 1966. If you believe that Cheri Jo Bates was stalked surreptitiously in the weeks or months before her death, then the Desktop Poem is the precursor or warning, and the Confession letter is the completion of that threat. 

If we look at the wording on the Riverside Desktop Poem (below) from the standpoint of somebody stalking Cheri Jo Bates, then it is perfectly conceivable that at some point in time the wannabe killer has noticed the young woman wearing a red dress and fantasized about making her pay for the "perceived brush-offs" he has endured. But what is noticeable, is that the author states "she won't die this time, someone'll find her". If the young woman was to be stabbed, why would someone necessarily find her? If his mind is seeing his fantasy in the present during school hours and in the context of a busy Riverside City College campus, then one could easily see how she could be rescued and survive. However, in the next line he is projecting his mind to the future by stating "just wait till next time". The only way "next time" could conceivably have a different outcome, is if he lures Cheri Jo Bates away from the Riverside City College campus - and this is exactly what he said he was attempting to do when he typed the November 29th 1966 Confession letter, thirty days after Cheri Jo Bates' murder. He stated "I then offered to help. She was then very willing to talk to me. I told her that my car was down the street and that I would give her a lift home".  

If the murderer of Cheri Jo Bates had made a promise to seek her out "next time" in the Riverside Desktop Poem, and had some connection to the college, or was in her near or outer circle, is it really realistic he would give his true initials at the foot of the Desktop Poem to give law enforcement a helping hand? On the other hand, if they weren't really his initials and he had just placed two random letters together, then it is a rather pointless exercise. The Zodiac Killer wrote "riverside" in the 1971 'Los Angeles' letter and "halloween"/"Halloween" in the questioned 1987 correspondence, showing yet again his ability to ignore the upper case form of these titles. It is these two words that may give us the meaning to the "rh" at the foot of the Desktop Poem. The poem indicated the necessity of the killer to separate Cheri Jo Bates from the college campus so somebody wouldn't find her in time, thereby resulting in her death. Had he achieved such an objective, then her death may very well have occurred past the midnight of October 30th, rather than around 10:30 pm when screams were heard emanating from the campus alleyway. He was ultimately thwarted by Cheri Jo Bates, who likely fought back vigorously when she was being coerced towards his vehicle. The killer ultimately boasted that this was not the case by stating "I said it was about time. She asked me 'about time for what'. I said it was about time for her to die".  This was clearly a line pulled straight from his imagination, to give the impression he was in complete control throughout. Had Cheri Jo Bates not fought valiantly against her abduction, then the prophecy of "rh" would have been realized: "Just wait till next time, riverside halloween".

On July 31st 1969, the Zodiac Killer wrote "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 Bay Area murderer was always promising more bloodshed in the future - and the Riverside Desktop Poem was no different. But on that occasion he gave us the exact time and place.    

I would like to expand on a previously discussed topic, regarding two cards likely mailed by the Zodiac Killer on March 22nd 1971 and July 13th 1971, dubbed the 'Pines' and 'Monticello' cards respectively. The March 22nd 'Pines' card contained the phrases [1] Sierra Club  [2] Sought Victim 12  [3] Peek through the pines  [4] pass Lake Tahoe areas and [5] around in the snow. The 'Monticello' card stated "Near Monticello Shought Victims 21 ...... In The Woods Dies April." One can see the similarities, with "sought" and "shought", "woods" and "pines", as well as "near Monticello" and "pass lake Tahoe areas". They were both directions to the location of a murder victim, but crucially, both postcards held the victims forenames within the design of each. They were so cleverly designed, it is difficult to believe they were not authored by the same individual, with two words linking both cards - Memorial Park. A memorial park is a designated area for remembrance of the departed. 

In the case of the 'Pines' card, the author chose a postcard of "an artist's rendition of houses among the trees at a Boise Cascade Company project at Incline Village, where construction has just begun on the development". He then directed us to "pass lake Tahoe areas" to an area by the "Sierra Club". If we follow these simple instructions we find ourselves at two locations in close proximity. The first is Clair Tappaan Lodge on Donner Pass Road - but more importantly - the second is Donner Memorial State Park (preserving the site of the Donner Camp, where members of the ill-fated Donner Party were trapped by weather during the winter of 1846–1847, resulting in 39 deaths). Bearing in mind the 'Pines' card was thought to have been mailed by the murderer of Donna Ann Lass, this may be the motivation behind its design. The author was pointing us towards the Donner Memorial to signify the forename of his murder victim. Of course, this could be a simple coincidence and not the intended meaning behind the postcard. Therefore, if we can find the identical design or meaning within its sister card, mailed on July 13th 1971 (just 4 months later), then we can just call it a double coincidence, or quite possibly accept that the designer fashioned them both with the intention to give us the forename of the murdered women in question.

The July 13th 1971 'Monticello' card stated "Near Monticello Shought Victims 21 ...... In The Woods Dies April." So we need to be looking for a woman who was murdered in April, in the woods and near Monticello. On Sunday, April 11th 1971, Kathy Bilek (18) visited Villa Montalvo in Saratoga, having planned to read a paperback book (The Gabriel Hounds) and engage in a spot of bird watching​ in the seclusion of a remote, wooded portion of the park, near a small stream. Her body was found the next day by her father, Charles, while Santa Clara County Sheriff's deputies searched nearby. She had been stabbed 17 times in the back and 32 times in her chest and stomach. Villa Montalvo is situated 9 miles west of the neighborhood of Monticello. The author of the 'Pines' card directed us to a Memorial Park called Donner. In the case of the 'Monticello' card, the author didn't need to direct us to her body, because she wasn't missing - and therefore we have to discover the purpose behind him choosing Monticello. This has to be the clue to the woman's forename, as well as the destination of a Memorial Park, if we are to satisfy the template of the 'Pines' card. 

Fortunately for us, another coincidence exists. Sitting in the Monticello neighborhood is Oak Hill Memorial Park, where one of Zodiac's previous claimed victims is interred. The Zodiac Killer insinuated his involvement in the brutal stabbing of Deborah Gaye Furlong (14) and Kathy Ann Snoozy (15), who were found murdered on August 3rd 1969 in the Bay Area of San Jose. By writing "Aug" on the November 8th 1969 'Dripping Pen' card, he was effectively laying claim to the Furlong and Snoozy murders - and the very reason he chose the location of Monticello on the July 13th 1971 postcard. Not only was Kathy Snoozy buried at Oak Hill Memorial Park, but she shared the same forename as Kathy Bilek. The Zodiac Killer was leading us towards a memorial park and forename in both postcards - Donna and Kathy.

Whether the Zodiac Killer was responsible for the murder of Cheri Jo Bates (18) in Riverside on October 30th 1966 has been widely debated. The young woman was found brutally stabbed on Halloween morning by groundskeeper Cleophus Martin. The Zodiac Killer would lay claim to this murder on March 13th 1971 when he stated in the 'Los Angeles' letter "I do have to give them credit for stumbling across my riverside activity, but they are only finding the easy ones, there are a hell of a lot more down there". This made it curious that the Zodiac Killer's previous communication was the October 27th 1970 'Halloween' card and its obvious implications of a murder related to Halloween. Sandwiched between the 'Halloween' card and 'Los Angeles' communications was the November 16th 1970 Paul Avery article in the San Francisco Chronicle declaring there was 'New Evidence in the Zodiac Killings.'  This seemed rather convenient timing immediately after a card based around Halloween.

The Riverside and Zodiac connection was first proffered by Phil Sins, who Michael Morford was fortunate enough to interview in 2012. He stated "that as far as he can remember, he initially asked Avery to contact Riverside Police, and that he only got involved directly with Riverside Police Department after he made contact with Avery. He stated that he linked the two cases just by the overall similarity in the taunting letters. It also got his attention that Bates was killed on Halloween Eve and Zodiac sent a Halloween card. He told Avery to look into it, and get a writing expert as there were writing samples in Riverside. He says he has monitored the case since making the connection. He himself never had any suspects nor did he have any theories in particular". This peaked my interest regarding the design of the Halloween card, and whether the Zodiac Killer was finally incorporating Cheri Jo Bates into his running victim total (now 14), whether or not he was responsible for her murder or not. If Phil Sins drew a connection between the 'Halloween' card and Riverside, what else may he have observed?      

The pumpkin placed over the first skeleton has always been a curiosity - unless of course - the Zodiac Killer is effectively 'date stamping' this claimed fourteenth victim. He placed the number 14 on the hand of the skeleton and placed a pumpkin over the pelvic region, not only associating this victim with Halloween, but scoring the victim count of 14 onto the skeleton itself. Bearing in mind the murder of Cheri Jo Bates was four years prior, was this choice of imagery relevant?

David Faraday (17), Betty Lou Jensen (16) and Michael Mageau (19) were three teenage victims of the Zodiac Killer, despite the fact that Michael Mageau survived the attack at Blue Rock Springs. Cheri Jo Bates (18) was also a teenager. The Zodiac Killer wrote the number 14 on the hand of the first skeleton, so could easily have written this number again over the skull of the skeleton on the card inner (shown right). He could have written "fourteen", but deliberately chose to separate the "4" and "TEEN", indicating that these offerings were to be interpreted as two separate words. In the spoken word, this could mean FOUR TEEN or FOR TEEN. The Zodiac Killer placed twelve eyes onto the 'Halloween' card (one was already present at manufacture), suggesting that these held an important significance to the message the card was attempting to prompt from the reader. The simplest answer, when we consider the addition above the skeleton's head, is "look for teen". In totality, the Zodiac Killer is effectively saying "look for teen, who I have inscribed as my fourteenth victim, discovered on Halloween". The pumpkin attached to the skeleton should be the biggest clue in this regard. 

Phil Sins contacted Paul Avery regarding the taunting letters and the 'Halloween' card observation, so it is no surprise that the Paul Avery article surfaced on November 16th 1970 putting forth a possible connection between the Zodiac murders and the brutal stabbing of Cheri Jo Bates in Riverside. But was the Zodiac Killer telling the truth when he stated "I do have to give them credit for stumbling across my riverside activity", and was the 'Halloween' card the prompt, subsequently interpreted by Phil Sins? 

Nobody knows for certain what the Zodiac Killer developed into after his brief, but deadly reign over Northern California during the late 1960s and early 1970s, but what we do know is that he mailed numerous letters threatening the police and promising to terrorize the citizens of the Bay Area by planting bombs. The December 7th 1969 and December 16th 1969 'Fairfield' letters stated "I will go for the Goverment life" and expressed disdain for the police, promising "any time now the will be a cop". 
These two letters were authored by the same individual, expressing "I just need help", but neither were published in the newspapers - so when the December 20th 1969 'Melvin Belli' letter arrived just days later with a piece of taxicab driver Paul Stine's shirt and proclaiming "please help me", it goes a long way to authenticating the Fairfield letters as genuine Zodiac correspondence. Rubislaw, a regular contributor to this site, pointed me in the direction of the Spiro Agnew Files in the FBI archives, regarding threats (including bomb threats) made to President Richard Nixon in 1973 (return address Leavenworth, Kansas). Rubislaw pointed to a comparison between these threats (of which there were many) to the Steve McQueen threat letter mailed in 1977 (which included a threat to President Jimmy Carter), and highlighted on the Zodiac Killer Site forum. The comparison is justified, irrespective of whether they were authored by the same individual, as the threats were aimed at high profile people in news and television. But for now I shall concentrate on the Richard Nixon threat and the December 16th 1969 Fairfield letter.    

Mark Hewitt, author of a trilogy of Zodiac books, argued a case for Theodore Kaczynski as the infamous Bay Area murderer, taking his bomb threats of 1970 into reality, when he initiated a bombing campaign in the late 1970s. Whether this is in fact the case remains to be seen, but the concept of the Zodiac Killer metamorphosing into another form of terrorism, clearly illustrated by his shift in emphasis during 1970 is not without merit. So, without further ado, we will compare the Richard Nixon threats with the December 16th 1969 Fairfield letter.

The December 16th 1969 Fairfield letter opened with the line "I just want to tell you this state is in trouble..I will go for the Goverment life". One of the Richard Nixon letters dated May 14th 1973 began "This is just to tell you, that you will die. There is no way to stop it believe me". There is a similarity in wording, which obviously may be coincidental, but both are a threat on "government life", refer to "pigs" or "cops", the two communications are written on lined paper and both have a circle as part of the logo. They are probably two separate individuals, but nevertheless, it cannot be dismissed out of hand that the Zodiac Killer may have gone through an evolution in the intervening three and a half years, developing the gravity of his threats. I certainly understand the drawbacks of handwriting comparisons, but here are the December 16th 1969, May 14th 1973 and June 8th 1977 (Steve McQueen) letters, all written on lined paper - and in which - each contained either "to tell you that", "to tell you this" and "to tell the people". 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

​If you take a look at the San Francisco Police Department DNA report, the 1974 Exorcist letter is the only letter that year to produce any viable results, described as "cells found". The S.L.A letter was totally disregarded, and the "Citizen" and "Red Phantom" communications had no entry in comments. If Alan Keel is correct in his assertion, then the Exorcist letter would enter the classification of unlikely Zodiac correspondences - ones that had "been licked by the sender". 

In the latest round of DNA testing in the Zodiac case, two of the three July 31st 1969 communications have again come under scrutiny. These were unavailable at the time the San Francisco Police Department DNA testing was undertaken. It is apparent that these letters have struggled to give up their secrets, as have other communications listed in the report, which includes the October 13th 1969 'Paul Stine' letter, the November 8th 1969  'Dripping Pen' card, the November 9th 1969 'Bus Bomb' letter, the December 20th 1969 'Melvin Belli' letter, the April 20th 1970 'My Name Is' letter, the April 28th 1970 'Dragon' card and the June 26th 1970 'Button' letter. In total, nine consecutive communications that, it is fair to say, have produced little in the way of a recognizable DNA fingerprint. Most of these are labelled in comments as "few cells".

The only remaining communications in the DNA report subsequent to June 26th 1970 which produced any notable results, classified as "cells found", were:
[1] The July 24th 1970 'Kathleen Johns' letter.
[2] The July 26th 1970 'Little List' letter, and
[3] The January 29th 1974 'Exorcist' letter.
And all three had one crucial element in common - The Mikado. 

The 'Kathleen Johns' letter began the trilogy by stating "So now I have a little list, starting with that woeman + her baby that I gave a rather intersting ride for a coupple howers one evening a few months back that ended in my burning her car where I found them".  This would be continued two days later with the paraphrasing of two of Gilbert and Sullivan's acts from The Mikado. The first section of the 'Little List' letter pulls lines from the A more humane Mikado, where the author uses the words billiard along with crooked cues and twisted shoes.
This correspondence goes on to paraphrase Gilbert and Sullivan's  As some day it may happen, performed by Ko-Ko, as did the future correspondence of the Exorcist Letter in 1974, when reciting Tit-Willow from Ko-Ko's On a tree by a river, part of Act Two.  

We don't know the exact concentrations of DNA retrieved from these three communications, but it is evident that these were the only three letters classified as "cells found" - and all three made reference to The Mikado. If "cells found" could be proven as "saliva" found, and the "true Zodiac verifiable letters had not been licked by the sender" according to Alan Keel, then this could indicate that all The Mikado letters were not authored by the Zodiac Killer. An extremely hard notion to accept when we look at the handwriting and design of each of these correspondences. 

One can understand why certain sections of the Zodiac communications were withheld from the public, such as his bomb diagrams - yet the entire July 26th 1970 'Little List' letter was not released to the newspapers until October 12th 1970. This innocuous correspondence for the most part was withheld for two and a half months until it featured in a San Francisco Chronicle article entitled 'Gilbert and Sullivan Clue to Zodiac', in tandem with the subsequent October 5th 1970 '13 Hole' postcard. If the 'Little List' letter and '13 Hole' postcard were authored by the Zodiac Killer, then it is notable that, despite putting a lot of effort into this rather lengthy correspondence on July 26th 1970, he failed to make any issue about the complete absence of newspaper coverage that this letter received when he mailed his next correspondence. It is believed he repeated his victim count of 13 because his last letter hadn't been published in the newspapers. But could it have been the case that the Zodiac Killer wasn't reaffirming the victim count of 13 because his previous correspondence wasn't published, rather, he was unaware somebody had mailed the 'Little List' letter in his name? Hence his lack of concern about "front page coverage", or for that matter, any coverage at all. 

If the Zodiac Killer hadn't written any of The Mikado communications, then he also wasn't claiming the abduction of Kathleen Johns on March 22nd 1970. In fact, the notion of a killer driven by the theatrical librettos of Sir William Schwenck Gilbert would be quashed entirely. It is extremely difficult to sell a story of a Zodiac Killer who didn't author any of The Mikado communications, let alone all of the 1974 communications - so the curtain call will be cancelled for this performance only.