On December 3rd 2020 David Oranchak, Sam Blake and Jarl Van Eycke unlocked the mystery to the 51-year-old 340 cipher, mailed by the Zodiac Killer on November 8th 1969. On December 7th 1969, the Zodiac Killer mailed a communication from Fairfield containing a 38 character code, yet to be broken. In recent years I have had little doubt that this letter was genuine Zodiac material, but the solving of the 340 cipher put to rest any lingering doubt regarding its authenticity.

​The author of the 38 character code prominently featured two sections of the 340 cipher, that included the beginning 4 ciphertext characters of the 340 cipher, and the last 5 ciphertext characters of the 340 cipher. The only logical reason for the Zodiac Killer to have done this, would have been to give us a clue to the solving of the 340 cipher. When the code key is applied to the 340 cipher before any period 19 (diagonal shift), the first 4 plaintext characters of the 340 cipher spell IRON. The last 5 plaintext characters spell DEATH. As previously pointed out, a hoaxer would have had to be extremely lucky to keep the beginning and ending of the 340 cipher intact, to the tune of 4 & 5 characters (when creating the Z38), that just happened to create two English words in these notable positions. One would have expected a lazy hoaxer to replicate ciphertext characters 333 to 338 in the 340 cipher, because these characters were close to the spelling of "Zodiac". But the author of the December 7th 1969 letter refrained from doing this, choosing to separate these 6 ciphertext characters, so as to form the word DEATH at the end of the 38 character code. 

After the solving of the 408 and 340 cryptograms in 1969 and 2020, there is a strong argument to be had, that the Zodiac Killer's remaining unbroken codes also contain a message, which includes the Z38 mailed just one month after the 340 cipher. I have attempted to tackle the Z38 code, but it needs an expert in code breaking to take a look at this encipherment, such as Dave Oranchak, who I believe could shed more light on this small code. The message beneath - at the very least - should provide a little more insight into the thinking of the Zodiac Killer during this crucial period. 

Did the Zodiac Killer create the 38 character code so soon after his November 8th 1969 offering as a prompt to the solution of the 340 cipher? I hope Dave Oranchak will take a look and possibly correct some of the incorrect assumptions I may have made. Thanks to Druzer, a regular contributor to both main Zodiac forums, for his assistance in this matter.
CLICK HERE FOR UNOBSTRUCTED VIEW OF CODE.

The breaking of the 340 cipher by David Oranchak, Sam Blake and Jarl Van Eycke on December 3rd 2020 was a fantastic achievement after 51 years, only slightly tarnished by the banality of the message encoded by the Zodiac Killer, in which he denied it was him on the Jim Dunbar Show, along with the usual paradice and slaves nonsense. However, it may have gone a long way to verifying two previous communications once considered inauthentic Zodiac letters. 

The 340 message stated "That wasn't me on the TV show", thereby suggesting by inference that the person who called into the Jim Dunbar TV show on October 22nd 1969 was an imposter and fraud. Shortly after the April 29th 1971 arrest of Karl Francis Werner for the murders of Kathie Reyne Snoozy, Debra Gaye Furlong and Kathy Bilek in San Jose and Saratoga, another cryptogram was mailed from Fairfield to the San Francisco Chronicle containing 148 characters. It too was effectively delivering a contemporary message, again claiming that the person (Karl Francis Werner) being 'interviewed' was an imposter and fraud, stating "Tis the Zodiac Speacking. Why can't you stop me. I can't stop killing. Stop listening t(o) phonys". The 340 cipher was unbroken in 1971, yet the author of another contemporary enciphered message was again claiming that the person in the spotlight was a "phony". The only difference this time was the Zodiac Killer was the "phony", falsely attempting to wrestle back the murder victims of Snoozy & Furlong on August 3rd 1969, that he had claimed in the Dripping Pen card mailed on November 8th 1969, with his addition of "Aug" in his chronological victim count of seven. He would further compound matters by adding the April 11th 1971 murder of Kathy Bilek to this list, when on July 13th 1971 he claimed her murder in the Monticello card by stating "In The Woods Dies April".

This should allay any doubts as to the authenticity of this communication, especially when you consider that the Monticello card "shought victims 21" just like the written message accompanying the 148 character cipher - and both were withheld from the newspapers.

The 340 cipher also went a long way to verifying the 38 character code, mailed from Fairfield on December 7th 1969, because both cryptograms isolated the word "death" at the end of each message. The person who created the Z38 deliberately separated the prominent ZO∆AIKꞮ+ characters on the bottom line of the 340 cipher, into AIKꞮ+ on the bottom line of the 38 character code. thereby manufacturing the word "death". Druzer, a valued contributor to both main Zodiac forums, pointed out the same thing, stating  "The most curious/compelling feats are that the author isolated actual words, most notably death, and that he refrained from copying Zodaik, which would certainly be expected of a hoaxer".  

The 340 cipher did indeed harbor a banal and relatively uninteresting message after a long 51 year wait, but it can be argued that the solving of the message contained within it, may have handed us two more confirmed Zodiac communications to examine, offering fresh insights into an investigation often blighted by stagnation. The Z38 can be connected to the 340 cipher through two notable portions of each code, The words IRON and DEATH can be found in both, before any period 19 shift is applied. If these two enciphered cryptograms are connected by beginning and end, then why should the middle section of the Z38 be any different. The Z38 and Z340 could very well be have a much bigger relationship, yet to be unearthed.

Early in December 2020, the 340 cipher was cracked by David Oranchak, Sam Blake and Jarl Van Eycke, which revealed the message shown below. Despite the fact the message left many rather deflated because of its banality, hoping it would reveal so much more, the message contained in the Dripping Pen card and the following Fairfield letters appear to show a running theme. It was recently highlighted how the 38 character code in the December 7th 1969 communication (1st Fairfield letter) showed a distinct correlation to the 340 cipher. Here is a brief recap:

If a Zodiac impersonator had created the 38 character code, this hoaxer would have had to guess that by separating the prominent ZO∆AIKꞮ+ characters on the bottom line of the 340 cipher, into AIKꞮ+ on the bottom line of the 38 character code, he would be reducing these characters to create something meaningful. He apparently did. By separating these characters into the five visible at the end of the 38 character code, he created the word "death", just like the solved 340 cipher. Druzer, an excellent Zodiac researcher, pointed out the same thing, stating "The most curious/compelling feats are that the author isolated actual words, most notably death, and that he refrained from copying Zodaik, which would certainly be expected of a hoaxer". In other words, he dismantled the ZO∆AIK element, while leaving Ɪ+ in place, to form "death" as the final word on the 38 character code. This appears to show knowledge of the hidden message in the 340 cipher. But there is so much more in the Fairfield letters that harks back to the Dripping Pen card and 340 cipher.

Despite stating in the above message he now had enough slaves to work for him in paradice, he would ultimately decide to "kill again" on December 7th 1969, in accompaniment to his brief 38 character code. The Zodiac Killer would never use the standalone word "life" outside of the November 8th and December 16th communications, yet he would end the 340 message with "life will be an easy one in paradice [death]", and begin the December 16th 1969 communication (2nd Fairfield letter) with "I just need to tell you this state is in troulbe, I will go for the Goverment life".

The Dripping Pen card containing the 340 cipher stated "Could you print this new cipher in your frunt page?", whereas the wording "you better print" preceded the small 5/9 character code in the December 16th 1969 letter. The decoded message in the 340 cipher (unknown to anyone until December 2020) began in mocking fashion, stating "I hope you are having lots of fun trying to catch me", while the message immediately beneath the small code in the December 16th 1969 letter stated "you will not catch me". It was almost as though the Zodiac Killer was replying to himself just over five weeks later, in absence of his cipher being solved.

On October 22nd 1969, the Oakland Police Department took a call in the early morning hours from somebody claiming to be the Zodiac, requesting that either Melvin Belli or Francis Lee Bailey, high profile lawyers at the time, appear on a chat show hosted by Jim Dunbar later that day. Melvin Belli agreed to appear on the show to which a man would eventually contact via telephone, claiming not only his name was 'Sam', but also by inference that he was the infamous Zodiac Killer. It was very quickly determined from Nancy Slover, David Slaight and Bryan Hartnell that the caller to the TV show wasn't the Zodiac Killer, which was confirmed by the decoded 340 message, which read "That wasn't me on the TV show". However, the Zodiac Killer didn't expand on who the person was that made the phone call to the Oakland Police Department. Whether he was leaving this open to speculation deliberately, nobody knows, but Oakland would feature in his murder destinations on December 16th 1969. This was the only time this city would feature by way of written text in any of the Zodiac Killer's communications, and it came just five weeks after the Bay Area murderer encoded the denial of "That wasn't me on the TV show". Was it a subtle admission that he did make the Oakland phone call to police and was now promising to murder eight of them, hence the renewed contact with Melvin Belli just four days later providing a piece of Paul Stine's shirt?

There are three things a hoaxer should not have known regarding the decoded 340 cipher message. [1] He shouldn't have known that by separating ZO∆AIKꞮ+ into AIKꞮ+ that it would produce the word "death" at the end of both codes, and provide a common link between the two. [2] He shouldn't have known that the opening line of the 340 message read "I hope you are having lots of fun trying to catch me", when he replied "you will not catch me" only 38 days later, unless you maintain that this is a coincidence. [3] He shouldn't have known that the Oakland inspired TV show had featured as a denial by the Zodiac Killer in the message, when he listed Oakland in the list of his murder sites.

The word "death" could be decoded using the Zodiac key through both the Z340 and Z38 within 29 days of one another. The December 16th 1969 letter also contained a configuration of four smaller crosshairs positioned around larger crosshairs, similar to the configuration of By Knife, By Gun, By Rope and By Fire on the Halloween card mailed on October 27th 1970. However, on this occasion the design was preceded by five characters. Could this be the word "death" once again, mirroring the Tim Holt comic book which likely inspired the design of the Halloween card in the first place? Anyway, "I thought you would nead a good laugh before you hear the bad news. Ha! Ha! Ha!"   

Since the decoding of the Zodiac Killer's infamous 340 cipher by Dave Oranchak, Sam Blake and Jarl Van Eycke earlier this month, it is now possible to almost certainly confirm the two letters mailed on December 7th 1969 and December 16th 1969 as authentic Zodiac communications. It has long been known that these two letters were authored by the same person, but it has always been difficult to convince certain sections of the Zodiac community these letters were penned by the Zodiac Killer, who insisted they were a hoaxer based on nothing more than handwriting analysis and the disorganized appearance of the coding in each. The following, will hopefully show that handwriting alone should never be used to dismiss a questioned Zodiac correspondence. By examining the encryption methods between the 340 and 38 character codes, much can be revealed

A 38 character code accompanied the Fairfield letter on December 7th 1969, just twenty-nine days after the Zodiac Killer's recently deciphered 340 cipher. This code contained only characters available in the 340 cipher, unlike the following 13-Symbol and 32-Symbol ciphers. This opened the door to the possibility that the 38 character code was somehow related to the 340 cipher and maybe contained a clue to its construction. Druzer, an avid and diligent Zodiac researcher, mailed me the 38 character code deciphered with the 340 cipher key. The result is mostly garbled, but he drew my attention to the final line of both codes ending in "death". The Zodiac Killer only took a 4+ horizontal combination of characters from the 340 cipher to the 38 character code on two occasions. Those were HER> and AIKꞮ+, which spelled the standalone words of IRON and DEATH, before the diagonal shift was applied to the 340 cipher to reveal the message. Despite the last two rows of the 340 cipher being a mixture of forward and backward reading words, the word "death" sits at the end of both the 340 and 38 character ciphers, indicating that this word likely concludes the message of the rearranged final two lines. It could mean that the final sentence of the 340 cipher is "life is death" rather than "death is life".   

Other horizontal words do exist in this format, however, the Zodiac Killer gave us 4 and 5 characters which bound the 340 and 38 character ciphers together, and both formed English words. The Zodiac Killer began and ended his 38 character code with two prominent sections from the start and end of the 340 cipher, both of which contained visible words before any shift was applied (The final word remaining static). This may be another observation, which confirms to the doubters the December 7th 1969 letter as an authentic Zodiac communication. Unless of course, the 38 code hoaxer identified two passages of 4 and 5 characters from the undeciphered 340 cipher, that just happened to accidentally find two English words after the 340 key was applied, specifically the two which began and ended the 340 cipher. This hoaxer would also have to guess that by separating the prominent ZO∆AIKꞮ+ characters on the bottom line of the 340 cipher, into AIKꞮ+ on the bottom line of the 38 character code, he would be reducing these characters to create something meaningful. He apparently did. By separating these characters into the five visible at the end of the 38 character code, he created the word "death", just like the solved 340 cipher. Druzer pointed out the same thing, stating  "The most curious/compelling feats are that the author isolated actual words, most notably death, and that he refrained from copying Zodaik, which would certainly be expected of a hoaxer". In other words, he dismantled the ZO∆AIK element, while leaving Ɪ+ in place, to form "death" as the final word on the 38 character code. This appears to show knowledge of the hidden message in the 340 cipher

This also opens up the possibility that the word "death" was present in the 5 character code on December 16th 1969, when the Zodiac Killer mailed his second Fairfield letter mimicking the yet to be designed Halloween card. The word "death" would then span three consecutive Zodiac ciphers from November 8th 1969 to December 16th 1969, with the Halloween card on October 27th 1970 the icing on the cake.

The November 8th 1969 greeting card came without a section of Paul Stine's shirt, as did the two Fairfield letters on December 7th 1969 and December 16th 1969. When neither of the Fairfield letters were published in the newspapers, the Zodiac Killer would add a shirt piece to the Melvin Belli letter just four days later. In the Melvin Belli letter the Zodiac Killer pleaded for help on four occasions, stating "please help me" on three of those occasions. The unpublished December 7th 1969 letter contained the phrase "I just need help".

While running experiments through the AZ Decrypt on December 3rd 2020, Dave Oranchak noticed two sections of text which grabbed his attention. A partial message appeared within the array of gibberish of "hope you are trying to catch me" and "or the gas chamber", that ultimately provided the chink of light to finally decode the Zodiac Killer's seemingly impenetrable cipher. The Zodiac Killer usually responded to the recent newspaper articles he had read, so the reference to "gas chamber" in light of the recent Jim Dunbar Show on October 22nd 1969, finally opened the door to a cipher many believed would never be solved. The collaboration between Dave Oranchak, Sam Blake and Jarl Van Eycke was about to bring an early Christmas present to everybody who has followed the Zodiac case for many decades. The dedication of Dave Oranchak in continuing to believe that a possible solution existed, despite the nagging doubts that the cipher may have been non-cryptographic in nature, is testimony to a man who ultimately followed his beliefs and succeeded - and a man that I have huge admiration for. Congratulations to everybody involved in finally decoding the Zodiac Killer's 340 cipher (shown below).

I HOPE YOU ARE HAVING LOTS OF FUN IN TRYING TO CATCH ME - THAT WASN’T ME ON THE TV SHOW - WHICH BRINGS UP A POINT ABOUT ME - I AM NOT AFRAID OF THE GAS CHAMBER BECAUSE IT WILL SEND ME TO PARADICE ALL THE SOONER BECAUSE I NOW HAVE ENOUGH SLAVES TO WORK FOR ME WHERE EVERYONE ELSE HAS NOTHING WHEN THEY REACH PARADICE - SO THEY ARE AFRAID OF DEATH - I AM NOT AFRAID BECAUSE I KNOW THAT MY NEW LIFE IS LIFE WILL BE AN EASY ONE IN PARADICE DEATH.

The inspiration for this message can be found in the pages of the San Francisco Examiner and San Francisco Chronicle from October 22nd 1969 to October 25th 1969. The first challenge came on the same day (October 22nd) as the Jim Dunbar TV show aired, when Professor D.C.B. Marsh of the American Cryptogram Association challenged the Zodiac Killer "to reveal his name in the cipher to established cryptogram experts, however complicated". The Zodiac Killer certainly made his encryption process more complicated, but unsurprisingly didn't give us his name. However, it appears that this challenge was the catalyst for his second and third cryptograms. The following day, on October 23rd 1969, the San Francisco Chronicle released an article entitled A TV Runaround With Zodiac Calls. Whether the Zodiac Killer watched the Jim Dunbar Show is incidental, because this article (on left) contained the possible inspiration behind the Zodiac Killer stating "I am not afraid of the gas chamber".   

The San Francisco Chronicle article on October 24th 1969 headlined with That Wasn't Zodiac, Say 3 Who Know, to which the Zodiac Killer would reply in his message in the 340 cipher by confirming "That wasn't me on the TV show". Then, on October 25th 1969, the San Francisco Chronicle ran another article entitled Cops No Closer on Zodiac Identity, containing the text "Zodiac struck last on October 11 when he gunned down cab-driver Paul Stine on Washington Street in Presidio Heights. He revealed himself the killer in a letter sent to the Chronicle three days later. Since then he has remained silent". The question would be, how was the Zodiac Killer going to respond to the silence attributed to him by Paul Avery? Probably by choosing a greeting card with a Dripping Pen and accompanied by the words "Sorry I haven't written, but I just washed my pen". The increased complexity of the coding used, along with everything the Zodiac Killer wrote in the decrypted 340 cipher, was likely inspired by these four consecutive newspaper articles in October. If the 340 cipher was specifically crafted subsequent to his purchase of the Dripping Pen card, then this more complicated offering was dreamt up between October 25th 1969 and November 8th 1969.

The excellent work of Dave Oranchak, Sam Blake and Jarl Van Eycke has permanently closed one chapter of the Zodiac Killer story, but has opened many more. "The chase is better than the catch" comes to mind, when that relenting pursuit of something just out of reach is finally taken away. The exhilaration of finally discovering the solution to a 51-year-old mystery, tinged with the realization that the search is finally over. Everybody likes a good mystery. But that mystery is no more.

One new path to pursue, may lie in the three immediate communications following the 340 cipher. Those three being, the November 21st 1969 letter mailed to the San Jose Police Department and the two Fairfield letters mailed on December 7th 1969 and December 16th 1969. All three contained rudimentary coding that may, or may not be clues pertaining to the 340 cipher. The December 7th 1969 code was particularly interesting because it contained 38 characters, many of which ran in sequences mimicking the 340 cipher.

Here is just a simple observation regarding the two December codes in respect to the 340 cipher solution and the reference to "death" on two occasions. If we take a look at the small fragment of code on the December 16th 1969 letter, you will notice that its design somewhat mimics the configuration on the Halloween card. We have five characters, followed by four small crosshairs in each quadrant of the large crosshairs. This had similarity to "paradice" and "slaves" fashioned in cruciform on the Halloween card, accompanied by the four methods of "death" in each quadrant. The Tim Holt comic book, believed to be the inspiration behind the Halloween card, actually carried the full message of "death by knife", "death by rope", "death by gun" and "death by fire". Therefore, the five characters of coding on the December 16th 1969 letter (precedent to the crosshairs) could be the word "death".   

Then I decided to use the plaintext 'solution' of "death" and place these alphabetical characters into the Zodiac Killer's code mailed on December 7th 1969. You will notice that the letters "A" and "H" are both represented by a circle with vertical line bisecting its midsection (which is unfortunate), so I will only use the first four plaintext characters of "DEAT" and place them into the first four corresponding ciphertext characters that appear in the 38 character code on December 7th 1969. It's nothing earth shattering, but this section of the cipher caught my eye.

The animosity of the Zodiac Killer toward law enforcement increased after Captain Martin Lee accused the Zodiac Killer of being a liar with respect to his escape into Presidio park, but at no time did the Zodiac Killer directly threaten to murder a cop until his two Fairfield letters were mailed on December 7th 1969 and December 16th 1969, both of which were seemingly disregarded as hoaxes and never published in the newspapers. The second Fairfield letter was particularly interesting because it actually provided a list of the number of cops he was going to kill in each city, including one in San Jose.

These were now direct threats to murder members of law enforcement. Not only had he never done this before, but to this point, no threats on San Jose had ever featured in any published newspaper articles. The San Jose letter mailed on November 21st 1969 also failed to make the newspapers, just like the two Fairfield letters. Yet, three days after the December 16th 1969 Fairfield letter, on December 19th 1969, somebody claiming to be the Zodiac Killer rang police dispatcher Shirley Searey at the San Jose Highway Patrol station issuing two threats that mirrored the contents of the Fairfield letter (despite the fact it was unpublished).

The Fairfield letter, mailed on December 16th 1969, contained the totals of police he wanted to kill. It also contained a picture of a dripping blade entitled The Bleeding Knife of Zodiac. This was effectively an extension of his "by knife" attribution on the car door of Bryan Hartnell at Lake Berryessa on September 27th 1969, glorifying in the fact he was responsible for the brutal stabbing of Bryan Hartnell and Cecelia Shepard alongside the Knoxville Road, as well as the frenzied murder of Kathie Snoozy and Debra Furlong on August 3rd 1969 in San Jose, which he would ultimately claim by the listing of "Aug" in his running victim count on the Dripping Pen card. The second Fairfield letter was clearly still in his mind (probably angered by its failure to be published), when he made the phone call to Shirley Searey at the San Jose Highway Patrol station on December 19th 1969. He now wasn't threatening to kill one cop in San Jose, he had upped that total to five, more in line with the rest of his list on December 16th 1969. The caller stated "I am going to kill five of you officers and a family of five between now and Monday". The phone call to the San Jose Highway Patrol station and the wording of "you officers", shouldn't leave anybody in any doubt as to where the threat was primarily aimed. Bearing in mind The Bleeding Knife of Zodiac drawing and the focus of the threat toward San Jose, we don't have to go very far to conclude which "family of five" he was threatening.   

The specificity of the threat to "kill a family of five" is highly suggestive that the caller had a particular family in mind. When you consider the caller was directing his threat toward the city of San Jose, take into account the "Bleeding Knife of Zodiac" drawing, his previous claim of responsibility for the Snoozy & Furlong murders in San Jose, and his annoyance at not receiving front page coverage in the Chronicle and Examiner newspapers subsequent to killing three people and mailing his cryptograms, the family of five becomes a little clearer. 

At the same time he was relegated to the inner pages of two high profile Bay Area newspapers, the murders of the two San Jose teenagers was extensively covered in the San Francisco Chronicle on August 6th 1969. The Zodiac Killer undoubtedly read this newspaper article - and it's probably an understatement to say - he must have been immeasurably displeased. We don't have to look very far in this publication to find the "family of five". 

The Zodiac Killer was already claiming the murder of Debra Furlong, so why not claim he was going to murder the rest of her family for maximum terror. Whether the police connected the dots is unknown, but it's unlikely he arrived at the figure of five randomly. If you look at the August 6th 1969 article here, you will notice the last two subheadings of "callers" and "children".
Under the banner of "callers" it describes the frustration of Glen Furlong (father of Debra) to the many annoying phone calls the family received, stating "On several occasions people have called and as soon as we answer, they hang up,"  He said his neighbors were "very sympathetic", but complained he found some of his phone calls "very disconcerting". Under the banner of "children" it lists his remaining children of Glen, 16; Floyd, 12, and Pamela, 11. With the Zodiac Killer having read this San Francisco Chronicle article (his inspiration for the Berryessa attack), it isn't very surprising that the "family of five" threatened by phone on December 19th 1969 would be Glen Furlong and his wife, along with their three children of Glen, Floyd and Pamela. 

This wasn't the only time the San Francisco Chronicle article on August 6th 1969 inspired the Zodiac Killer. It triggered his switch from gun to knife in the Lake Berryessa attack so as to secure front page coverage. It was also the inspiration for the wording "Near Monticello" on the July 13th 1971 communication, detailing the murder of Kathy Bilek on April 11th 1971. The Zodiac Killer very likely kept many of the newspaper cuttings relevant to the time he was operating - and this could have been one of them. What hoaxer in 1971, claiming to be the Zodiac Killer, could have remembered that Kathie Snoozy was buried at Oak Hill Memorial Park in the neighborhood of Monticello, with enough knowledge to have tied together the murders of Bilek, Snoozy and Furlong under one communication. The person who created the Monticello card on July 13th 1971 knew her burial location, because August 6th 1969 was a time extremely pertinent to him. A time when the Zodiac Killer would have been scouring the newspapers for updates on his 408 cipher and whether it had been decoded. The December 19th 1969 phone call to San Jose threatening a "family of five", more evidence that this newspaper article held high importance in the mind of a single perpetrator. That perpetrator being the Zodiac Killer.  

The hostility exhibited by the Zodiac Killer toward police began on November 9th 1969 when he responded to what he believed were disparaging remarks by SFPD's Captain Martin Lee. In the San Francisco Chronicle on October 18th 1969 under the headline Zodiac Called a Clumsy Criminal, the newspaper listed the mistakes it believed were made by the Zodiac Killer.

Captain Martin Lee stated "His boast of being in the area we were searching was a lie. We had the whole area flooded with lights. We had seven police dogs and a large number of patrolmen searching the area tree by tree and bush by bush. The dogs are the best in the country". Captain Lee added that Zodiac's failure to mention the dogs and floodlights was proof "he wasn't anywhere in the vicinity". The Zodiac Killer responded on November 9th 1969 with "I have grown rather angry with the police for their telling lies about me. The dogs never came with in 2 blocks of me + they were to the west + there was only 2 groups of parking about 10 min apart then the motor cicles went by about 150 ft away going from south to north west". 

Captain Martin Lee also appeared on a KPIX News report on November 12th 1969, responding to the November 8th and November 9th communications. He mentioned the Zodiac Killer's aggressive temperament in the Bus Bomb letter, noting the shift in "tenor of this letter as opposed to the others. For the first time he has demonstrated a hostility toward police. Now we are blue pigs and such remarks as that. He has never been particularly interested in our profession before this".  Just over three weeks later this hostility would continue, when on December 7th 1969 the Zodiac Killer mailed a letter from Fairfield promising to "kill again, so expect it anytime. The will be a cop".  He would continue the threats on police in his following letter on December 16th 1969. In this letter he immediately began with "this state is in troulbe..I will go for the Goverment life", suggesting a shift in the Zodiac Killer's thinking to more high profile targets. Law enforcement operates primarily through governmental police agencies in the United States, so the threat to target "government life", bearing in mind his threat to kill a cop on December 7th 1969, it's a reasonable assumption that "government life" = cops. Especially when he listed a potential thirty-eight police targets at the foot of the December 16th 1969 letter.     

The shift exhibited toward police was brought about by the comments of Captain Martin Lee, resulting in the introduction to the Bus Bomb letter of "This is the Zodiac speaking up to the end of Oct I have killed 7 people. I have grown rather angry with the police for their telling lies about me. So I shall change the way the collecting of slaves. I shall no longer announce to anyone. When I committ my murders, they shall look like routine robberies, killings of anger, + a few fake accidents, etc". Followed by the two Fairfield letters in December.

However, there was one other shift in the Zodiac Killer's communications subsequent to the KPIX interview with Captain Martin Lee on November 12th 1969. The police chief stated "I think the rambling, careless appearance of his notes is also a disguise. The cryptograms when he makes them can be absolute works of art as far as alignment both vertically and horizontally and space between the characters is concerned. I think that goes more toward the true picture of a man than the rambling notes that we've gotten". Captain Martin Lee believed the organized cryptograms structured like "works of art" were more toward the true picture of the Zodiac Killer. The next letter to a San Francisco newspaper was........    

The Zodiac Killer was incapable of keeping the secrets to his ciphers for any length of time, arguable by his eagerness in responding to the various newspaper articles about his crimes. The two Fairfield letters, mailed on December 7th 1969 and December 16th 1969, were perfect examples of a killer who could barely go one month subsequent to the "340" cipher before hinting at the workings of his masterpiece cipher.

The December 7th 1969 cipher of 38 characters was the beginning of many short and apparently unsolvable codes. The sheer fact that he mailed the Z38, Z9, Z13 and Z32, comprising of no more than 92 characters in total, should have set off the alarm bells that these codes were nothing more than a message only understood to their designer without further input. That further input began only 29 days after the mailing of the "340" cipher with the wording of "paradice" and "slaves", gleaned from the 408 cipher of "the best part of it is that when I die I will be reborn in paradise and all the (people) I have killed will become my slaves" - and would play an integral part in the Z38 and Z9 codes, as they did in the superficial design of the November 8th 1969 "340" cipher and the configuration on the October 27th 1970 Halloween card. The chosen phraseology of "paradice and slaves" long preceded the Halloween card and the presumed Tim Holt comic book connection.

Nobody can dispute that "paradice" and "slaves" can be slotted into the 340 cipher in cruciform. The only dispute is whether it was unintentional or by design. That is why we must turn (in absence of the code in the November 21st 1969 letter) to the Zodiac Killer's next two cryptic offerings on December 7th and 16th. He gave us three consecutive coded communications after the 340 cipher, that may show the Bay Area murderer's incompatabilty with keeping secrets, especially when you consider that these three codes were hopelessly short of characters - and as such - designed as clues to the workings of the 340 cipher rather than standalone codes in their own right. The codes of the Z38, Z9, Z13 and Z32 were all simplistic in nature, to be later revealed from July 26th 1970 to October 27th 1970. The one sure thing we know of the Zodiac Killer, was his narcissism and his inability to withhold communication from the newspapers. Irrespective of this character trait, we assume he was able to remain deathly silent regarding his codes for up to 51 years.

The fact that the December 7th 1969 and December 16th 1969 letters came within nine days of one another, separated by 29 days from the 340 cipher, facilitates an argument based on their limited characters, that these two Fairfield codes contained clues to the workings of the 340 cipher and therefore carried the same purpose. If we remove 14 characters (paradice, slaves) from the total of the Z38 code, we would have 24 characters remaining  (by fire, by rope, by knife, by gun). Those 14 characters present at the base of the Z38, separated into rows of 6 and 8 characters (paradice, slaves). The others rows conveniently accommodating the remainder of the Halloween card phrase of by fire, by rope, by knife and by gun. 

The second Fairfield letter (Z9 code) effectively becomes a 29 character code of DEATH by fire, by rope, by knife, by gun - and the rudimentary forerunner to the Halloween card configuration - inspired by the Tim Holt comic book, which harboured the word "death" as a precursor to the instrument of death. Unless, we conclude that the two designs in the Fairfield letters were another case of unintentional scrawlings, lacking any meaning whatsoever. The design of the Z9 code with four small crosshairs around the larger crosshairs would have to be regarded as an unfortunate mirroring of the Halloween card, only nine days after a code of 38 characters was mailed in the December 7th 1969 letter (paradice, slaves, by fire, by rope, by knife, by gun). Not withstanding that death, paradice, slaves, by fire, by rope, by knife and by gun are all self-contained on a separate row.

This interwoven pattern traversing the four communications of November 8th 1969, December 7th 1969, December 16th 1969 and October 27th 1970 will still be categorized under the category of unproven and likely unintentional. Short of a cryptographic solution to the 340 cipher, approaches to the codes such as the one presented here, will always be discarded and casually dismissed under the banner of "seeing patterns in the clouds" - thereby making any non-cryptographic solution to these codes and ciphers a non-starter. This means, that if the Zodiac Killer created a puzzle rather than a cryptogram, you will never be able to prove the case. Therefore, I have just wasted my time writing this article.

It is now fairly clear that the Tim Holt comic book connection, discovered by Tahoe27 in 2013, was integral to the Zodiac Killer agenda from the very outset. His determination to gather slaves for the afterlife by way of gun, knife, rope and fire, was probably rooted more in fantasy than reality, but it would feature heavily through four cryptic communications. When the Zodiac Killer realized there was inadequate information in the June 26th 1970 Mount Diablo code, he rectified the situation in just 30 days, giving us the answer to where the bomb was set via two prominent Zodiac crosshairs and a small piece of text. When the Zodiac Killer crafted and mailed the 340 cipher on November 8th 1969, he again gave us insufficient information to decode. However, he did state "PS could you print this new cipher in your frunt page?" But just like the Mount Diablo code to which he gave us the answer in 30 days, he would give us the full answer to the 340 cipher in only 29 days.

For anybody believing that the two Fairfield letters mailed on December 7th 1969 and December 16th 1969 were just a hoaxer, unrelated to Zodiac, then they have to explain, not only what purpose they served, but how the 38 character code manufactured by a lazy imbecile, incapable of even recreating a credible Zodiac Killer communication, just so happened to design five lines of 12, 7, 5, 6 and 8 characters, which could by sheer accident allow by fire, by rope, by knife, by gun, slaves and paradice to fall nicely onto each line. Ten words, self-contained on each line, which just happened to correlate with the October 27th 1970 Halloween card, ten months in the making. Not to mention, that by fire, by rope, by knife, by gun, slaves and paradice can be found in the "word search" 340 cipher just 29 days prior, in exactly the same design as the Halloween card.

Any doubts that the December 7th 1969 coding was a hint to the solution of the 340 cipher, should have been lessened by the inclusion of many repeating sequences of characters from the November 8th 1969 offering. The above configuration in the 340 cipher will probably be described as accidental by eminent codebreakers. However, if the December 7th 1969 author was just an ignorant charlaton, bereft of the solution to the 340 cipher, who just slapped a quick and meaningless 38 character code together, then it has to be purely by chance once again, that he managed to fortuitously create a code of 38 characters that mimicked the exact character count of by fire, by rope, by knife, by gun, slaves and paradice, present in two other cryptic communications mailed by the Zodiac Killer. Not only was this extremely lucky, but the clown impersonator of Zodiac, would for a futher time, just happen to create another cryptic addition on December 16th 1969 that mimicked the Zodiac designs in the 340 cipher and Halloween card.  

The Zodiac Killer was rather quite polite on November 8th 1969, when he cordially requested "could you print this new cipher in your frunt page?" However, after 38 days his patience was running thin, aghast at the inability of code breakers to pry open his simplistic cipher. In fact, he was starting to get bloody pissed off with authorities, demanding "you better print" in his December 16th 1969 letter (see right). Underneath his demand was yet another clue to his 340 cipher, and a design that again mimicked the yet to be mailed Halloween card.

The Tim Holt comic book connection unearthed by Tahoe27 (displayed in the Halloween card), not only contained the four phrases of by gun, by knife, by rope and by fire in each quadrant, but they were preceded by the word "death" in the comic itself. Exactly as depicted in the configuration on the right.
There are five characters, followed by four crosshairs placed around a larger crossed circle. This hoaxer was certainly having a bit of luck, creating 38 characters to mimic the Halloween card words of paradice, slaves, by gun, by knife, by rope and by fire, but also mimicking the design - including each mode of murder by the possible 5-letter introduction of "death", found on the wheel of the Tim Holt comic book.

The luck doesn't end there mind. The author of the December 7th 1969 letter wrote the words "I just need help". The phrase "please help me" would appear thrice in the authenticated Melvin Belli letter on December 20th 1969, despite the fact neither of the two Fairfield letters were ever published in the newspapers. Damn, this hoaxer is seemingly getting a lot of things correct, even thirteen days and ten months in advance.

The notion of a Zodiac Killer, who bragged, boasted and put pen to paper at every opportunity, is seemingly disregarded when it comes to his codes and ciphers. We are led to believe that a killer with marker pen diarrhea, writing to the newspapers on an almost monthly basis for two years, managed to keep his big fat trap shut for just over fifty years with respect to his codes. The designs in the December 7th 1969, December 16th 1969 and October 27th 1970 communications suggest otherwise. He would give us the answer to the 340 cipher in just 29 days (albeit inadequate), and give us the answer to the Mount Diablo code in only 30 days, when the Little List letter rolled along. The idea of a killer with extreme patience, upwards of 50 years, is not a killer I recognise.  

It is very likely that the Lake Berrryessa attack on Bryan Calvin Hartnell (20) and Cecelia Ann Shepard (22) was inspired by the newspaper articles in the August 4th 1969 San Francisco Examiner and August 6th 1969 San Francisco Chronicle. Both ran major news articles on the brutal murders of Deborah Furlong (14) and Kathy Snoozy (15) in San Jose on August 3rd 1969, while the Zodiac Killer was relegated to the lesser pages, despite his three murders and boastful communications, that included his cryptic puzzles. He knew that a savage close-quarter knife attack was required - and the tactic worked - because law enforcement subsequently pondered a connection between the Zodiac crimes and the Snoozy and Furlong murders in San Jose. The Zodiac Killer also acquired his front page coverage and the added bonus of bolting two extra victims onto his total in the Dripping Pen card on November 8th 1969. He would further implicate his connection to the San Jose murders by threatening a widow in the November 21st 1969 San Jose code letter. However, it didn't stop there.

There is one crucial feature of the first eight Zodiac letters, in that none explicitly threatened the lives of law enforcement, other than the wording "If you cops think I'm going to take on a bus the way I stated I was, you deserve to have holes in your heads" in the November 9th 1969 Bus Bomb letter. Then, three unpublished letters and one particular phone call arrived. The San Jose code letter threatened a woman in San Jose on November 21st 1969, followed by the December 16th 1969 Fairfield letter threatening cops in numerous cities, including San Jose. Both unpublished, yet both continuing the San Jose theme. It is also significant that the November 21st 1969 communication was mailed directly to the police in San Jose. In between the November 21st 1969 and December 16th 1969 letters was another Fairfield letter, mailed on December 7th 1969 and also threatening cops. It stated "I will kill again, so expect it any time the will be a cop". We now have three communications with a continuing theme of threatening police, none of which were published in the newspapers. Either these letters were from the Zodiac Killer, or a hoaxer had inferred the San Jose connection from the "Aug" month on the November 8th 1969 Dripping Pen card all by himself. Bearing in mind the similarity between both Fairfield letters in handwriting and mailing location, and the "real" Zodiac mailing the Melvin Belli letter on December 20th 1969, pleading for "help" just like the December 7th 1969 Fairfield letter, it leaves little doubt of a single author throughout. But what of the phone call to police on December 19th 1969, the day before the Melvin Belli letter?    

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

I now believe this was the Zodiac Killer. This telephone call came off the back of a previous direct correspondence with San Jose police just a month earlier. It also continued the theme of threatening police officers (five to be exact), just like the unpublished Fairfield letters -  in particular, the December 16th 1969 communication threatening the lives of up to 38 police officers. Two contacts from an individual just three days apart, both claiming multiple threats on police. For this to be two separate individuals, not only targeting San Jose police in such close proximity to one another, but also be separate to the author of the unpublished November 21st 1969 letter to San Jose police, would be quite something. There may be even more reason to believe the phone call to Sergeant Robert Rengsdorff was the Zodiac Killer.

The threat of killing "a family of five between now and Monday" is rather specific, almost as though he had earmarked a couple with three children. We know the Zodiac Killer read the August 4th 1969 San Francisco Examiner and August 6th 1969 San Francisco Chronicle, which inspired his attack at Lake Berryessa and subsequent claim to the Snoozy and Furlong murders by the addition of "Aug" on the November 8th 1969 Dripping Pen card. This is an obsession he would carry forward into 1971, referencing the Snoozy and Furlong murders at least two more times, if not three. The August 6th 1969 San Francisco Chronicle article, entitled The Frenzy Of San Jose Girls Slayer, read under the banner of 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 Furlong's had three surviving children called Glen, 16; Floyd, 12, and Pamela, 11, which ties in with the threat from the December 19th 1969 telephone caller to kill "a family of five between now and Monday". This would not only have continued the threat regarding the Snoozy and Furlong murders, but also the phone call was directed towards San Jose. The question to be asked is, did law enforcement consider this a possible connection to the Furlong family and offer them protection as had been given to the widow on November 21st 1969? We know of two certain Zodiac phone calls, so was this the third? The August 6th 1969 San Francisco Chronicle article also contained the burial location of Kathy Snoozy at Oak Hill Memorial Park. The cemetery is situated in the Monticello neighborhood of San Jose, which featured in Zodiac's July 13th 1971 Monticello card.  

On December 10th 1969 a paste-up horoscope communication was mailed and postmarked PM from Sacramento entitled Day-By-Day Forecast for Cancer, followed by a similar communication mailed and postmarked PM from San Francisco on December 11th 1969 entitled Day-By-Day Forecast for Leo. Not published in the newspapers, it was clear that both of these communications had the same author just one day apart. The following is a summary of the abduction and murder of Leona LaRell Roberts by Steph54 on Websleuths:

On Wednesday, 10 December 1969, 16-year-old Leona Larell Roberts worked her first day at a part-time job at the White Front Discount Store in Pleasant Hill. After her 1-5 p.m. shift, she drove to her boyfriend's apartment (749 Tormey Ave, Rodeo) where she planned to cook him dinner. At the time, Leona attended K's American Beauty College in Napa, where she also lived with her mother. Within 15 minutes of arriving at her boyfriend's apartment, a neighbor heard a girl scream. The neighbor called the sheriff and soon after heard someone running down the stairs at the back of the apartment house followed by the slam of a door from the direction of the downstairs apartment where Leona's boyfriend lived. When the boyfriend arrived, he saw Leona's red VW out front but did not find her inside the apartment. The apartment was dark and the back door was unlocked. He noticed scuff marks on the wall near the back door. He found that a pair of his pants had been removed from the bedroom closet and left on the living room couch, the belt missing. He noticed Leona's work smock crumpled on the couch. A sheriff's deputy arrived 30 minutes after the call. Another neighbor told the deputy of seeing a white male, about 25 years old, short blonde hair, acting suspicious. He walked several times from the front door to the rear of a blue station wagon before driving away. On 28 December 1969, a man searching for driftwood on the beach at Bolinas Lagoon in Marin County found the nude body of Leona Roberts.

From the postmark dates and times it is extremely likely the Forecast for Cancer communication was mailed prior to the abduction/murder of Leona Roberts, with the Forecast for Leo communication likely mailed after her abduction/murder. This meant that the author of the Cancer communication on December 10th in Sacramento traveled to San Francisco to mail the second correspondence. The most direct route is shown below and uses only Interstate 80. This journey between communications passes just 0.9 miles from the 749 Tormey Avenue residence from where Leona Roberts was abducted. 

Less than 24 hours after the abduction/murder of Leona Roberts, the Forecast for Leo communication arrived. Was the perpetrator using a play on words to hint that her forecast was in his hands? The Forecast for Cancer communication was emblazoned with the pasted text of Zodiac - and we know that the Bay Area murder has become synonymous with abduction and murder. How many abductions and murders occurred in the Bay Area on December 10th 1969? Yet here we have two sinister communications mailed in Sacramento, followed by San Francisco, where the most direct route using Interstate 80 passes just 0.9 miles from the abduction site of Leona Roberts, which is then followed by a communication entitled Forecast for Leo. If this is a coincidence, it is one hell of a lucky one.

The question arises though - was the author of the two communications the Zodiac Killer or an impostor? Had somebody close to Leona Roberts planned her murder, and by mailing these communications with the word Zodiac in bold lettering, attempted to shift the focus of the investigation onto the Bay Area murderer, thereby making him the convenient fall guy? However, if the author of the Cancer and Leo communications wanted to achieve this goal, why would he be so cryptic? By sending a correspondence with nothing more than a heading of Day-By-Day Forecast for Leo, you are leaving open the possibility that investigators will not make the connection between the communication and the abduction of Leona Roberts. If you are attempting to lay the abduction squarely at the feet of Zodiac, then you simply create a communication using the pseudonym Zodiac and mentioning Leona Roberts by name, thereby creating no ambiguity. This may put the ball back in Zodiac's court.   

But it doesn't end there. Two more Zodiac communications were mailed either side of the above two forecasts. The first was mailed on December 7th 1969 from Fairfield, with the second arriving from Fairfield on December 16th 1969. These again fall directly along Interstate 80. If the four communications were the work of the Zodiac Killer, then we have a murderer mailing a correspondence from Fairfield on December 7th, before traveling northeast to Sacramento, then abducting Leona Roberts in Rodeo and continuing on to San Francisco, before heading back to Fairfield on December 16th. The author of four consecutive communications would possibly be using one direct route back and forth.

The Bus Bomb letter mailed on November 9th 1969 claimed seven victims, while the Melvin Belli letter mailed on December 20th 1969 claimed a search for number nine and ten. The December 7th 1969 Fairfield letter claimed no update to victim seven, leaving open the possibility that the abduction and murder of Leona Roberts on December 10th 1969 was victim number eight.

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.

In the article Three Months After the Mount Diablo Code we showed how the Zodiac Killer gave us the answers to his three main unsolved ciphers in three consecutive communications spanning July 26th 1970 to October 27th 1970. Here we will do exactly the same thing regarding the December 7th 1969 Fairfield Letter (the companion to the December 16th 1969 letter). The December 7th 1969 letter showed traits of the 408 cipher, in which the author had simply dragged characters from above to provide filler for the remaining 18 unsolved characters. In the December 7th 1969 letter he had dragged groups of characters from the 340 cipher in similar fashion. 

Tahoe27 made an excellent discovery when she linked the October 27th 1970 Halloween Card to the Tim Holt comic book, showing the connection to the configuration displayed on the card in the wording By Fire, By Gun, By Rope and By Knife. However, the Zodiac Killer had likely made this connection much earlier than October 27th 1970, when he designed the December 16th 1969 Fairfield Letter (shown on the left}. In this communication he gave us a rudimentary design of the Halloween Card configuration preceded by the word "death", thereby satisfying the Tim Holt comic book of "Death By Fire, By Gun, By Rope and By Knife. Below I have shown the interconnectivity between the Halloween Card, 340 cipher and both Fairfield letters, demonstrating how the Tim Holt comic book played a part in the design of them all, with By Fire, By Gun, By Rope, By Knife, Paradice and Slaves the running theme.

The December 16th 1969 Fairfield Letter was essentially a very rudimentary precursor to the Halloween Card design of By Fire, By Gun, By Rope, By Knife, Paradice and Slaves. It was also very likely a clue to the December 7th 1969 code scribbled at the base of that letter, containing 38 characters. If this code followed the same way as all the others, in that the Zodiac Killer simply provided us with the answer to his codes in later communications, then what are the chances the solution depended on the wording in the Halloween Card, which mimicked the design of the second Fairfield Letter?

The December 16th 1969 Fairfield Letter stated "Look for more blood", then provided us with the Halloween Card style design of large crosshairs surrounded by four smaller crosshairs in each quadrant, intended to signify By Fire, By Gun, By Rope, By Knife, Paradice and Slaves. But the Zodiac Killer inexplicably chose the over inflated promise of 38 more victims from San Francisco, San Jose, Vallejo, Napa, Fairfield, Sacramento and Oakland. Curiously, the exact same number as characters on the December 7th 1969 Fairfield Letter. These victims, likely to be murdered By Fire, By Gun, By Rope and By Knife. So, was there a correlation between the two letters using these words? You will notice that the code above hasn't been structured uniformly like the 408 and 340 ciphers, but 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, satisfying the non-uniformity displayed by the 38 character code. We now have By Fire, By Gun, By Rope, By Knife, Paradice and Slaves running through four communications - that of the Halloween Card, 340 cipher and both Fairfield letters. The Zodiac Killer yet again supplying us with the answer to one of his codes in subsequent communications.          

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

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

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

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

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

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

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

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

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

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

The December 16th 1969 Fairfield letter has its own unique design, written on lined paper threatening "government life" and 38 cops in San Francisco, San Jose, Vallejo, Napa, Fairfield, Sacramento and Oakland. This correspondence was not released to the newspapers, thereby making any subsequent letter mirroring this communication all the more significant. Any future author could not be accused of copycatting the Zodiac Killer using the Fairfield letter as their guide. That is what makes the "Jimmy Carter" letter, mailed on June 8th 1977, so very interesting when placed alongside the 'Zodiac letter' from December 16th 1969. 

The FBI files stated "Enclosed for the bureau is one copy of a letter threatening to kill numerous political figures and television personalities and envelope postmarked Sacramento, California 6/8/77. For information of the bureau, on 6/9/77, the Sacramento Bee newspaper received the enclosed letter and information was developed that captioned subject was currently under indictment for threatening to kill the president and a check with U.S. Secret Service, Sacramento, confirmed this. On 6/9/77 Assistant U.S. Attorney Donald Heller, Sacramento, determined that redacted had been sentenced that day for violation of Title 18, section 871, Threats to Kill the President to an indeterminate sentence under the Youth Corrections Act. Based on this information, Assistant U.S. Attorney Donald Heller advised he would consider no further prosecution of captioned subject. On 6/19/77, the originals of the enclosed letter and envelope were turned over to the U.S. Secret Service Agent to be made a part of their case".            

The candidates threatened high on the list are elected government officials from the Democratic Party, followed by television personalities - with President Jimmy Carter top of the hit list of 30. The December 16th 1969 Fairfield letter also threatened "government life", with 38 people placed in a similar list at the foot of the letter Two letters, both on lined paper, separated by nearly eight years, and both promising to kill 30+ people. Let us take a closer look at the Jimmy Carter and Fairfield letter alongside each other. The Fairfield letter has been placed beneath the Jimmy Carter letter in the image below. 

I have highlighted certain areas of interest in blue, green and red. In the Jimmy Carter letter the author begins with "this letter has been written to tell the people", whereas in the Fairfield letter the author begins with "I just want to tell you". The Jimmy Carter letter then threatens the "following people to be killed", with the Fairfield letter stating "I will kill more people". And finally, the Jimmy Carter letter concludes with "you better carry out the demand", with the Fairfield letter ending with "you better print".  Not withstanding the similar construct and tone of each letter, along with the lined paper, the handwriting is comparable. Furthermore, if we compare these two letters with the threat letter to Richard Nixon (more government life) on May 14th 1973, we see a pattern. The December 16th 1969, May 14th 1973 and June 8th 1977 letters, all begin with either "to tell you that", "to tell you this" and "to tell the people".