ZODIAC CIPHERS
RICHARD GRINELL, COVENTRY, ENGLAND
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TWO LETTERS RECEIVED ON JULY 27TH 1970?

7/25/2025

 
PictureSAN FRANCISCO CHRONICLE, OCT 12TH
From July 31st 1969 to March 13th 1971 virtually all Zodiac communications contained the signature of the "crosshairs", placed at the foot of each correspondence only once (with the exception of the 340 cipher). The "Little List" letter, postmarked July 26th 1970 and received by the San Francisco Chronicle the following day, contained two large crosshairs and deviated from his worded letters by having this extra addition. The first crosshairs mailed to The Chronicle carried the victim total of 13 (which would normally finish a communication). If the Zodiac Killer had either sealed this envelope, or already mailed this communication, it's possible he felt the need to write a second letter which began "As some day it may hapen" from Gilbert & Sullivan's "The Mikado", with a second crosshairs signature containing the crucial phrase of "P.S. The Mt. Diablo code concerns Radians + # inches along the radians". In other words, the Zodiac Killer mailed two communications on (or shortly before) July 26th 1970.  

The San Francisco Chronicle on October 12th 1970 clearly stated that two letters were "sent to The Chronicle last July 27". In the San Jose Sunday Mercury newspaper they reported that "This was the new total he claimed in two letters received July 27 by the San Francisco Chronicle and kept secret until now by agreement with police while the letters' contents were analyzed. The longer of the two letters begins: "As some day it may happen that a victim must be found". Bearing in mind that these two letters were kept "secret" by investigators and the San Francisco Chronicle for 2 1/2 months, it probably isn't surprising that the Zodiac Killer chose a greeting card with the opening line "From your secret pal".​

PictureSUNDAY MERCURY, OCT 18TH
​The San Francisco Chronicle newspaper article on October 12th 1970 was entitled "Gilbert and Sullivan Clue to Zodiac", so again, the greeting card's following line of "I feel it in my bones, You ache to know my name, And so I'll clue you in" was perfectly chosen. It is fairly obvious that the Halloween card was mailed in response to the San Francisco Chronicle newspaper article on October 12th 1970. The Zodiac Killer even mimicked the "chalk-like writing" on the presale card to add "4-TEEN" onto the greeting card inner. The newspaper stated "And he is now claiming he has murdered 13 persons. Homicide detectives who've been hunting Zodiac for nearly two years frankly admit he is as much an enigma now as he was on Dec 20, 1968, when he chalked up his first two victims" (which were David Faraday & Betty Lou Jensen). In this period of nearly two years the Zodiac Killer only ever claimed the lives of 4 teenagers, who were David Faraday, Betty Lou Jensen, Kathie Snoozy and Debra Furlong. Therefore, David Faraday & Betty Lou Jensen were probably included in his "chalked" 4-TEEN victim total. 

​The two large crosshairs may have ended each letter received by the San Francisco Chronicle on July 27th 1970, to begin the outside possibility we have a second envelope either lost or misplaced. However, It must be stressed that it's unlikely two letters were mailed by the Zodiac Killer when we re-evaluate the wording contained within the newspapers, which are in direct conflict with several FBI files that document a "Five page letter and envelope". But if one envelope did get misplaced, this would be the obvious conclusion.      

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LOS ANGELES EVENING AND SUNDAY HERALD EXAMINER, OCTOBER 12TH 1970

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    The Zodiac Killer may have given us the answer almost word-for-word when he wrote PS. The Mt. Diablo Code concerns Radians & # inches along the radians. The code solution identified was Estimate: Four Radians and Five Inches To read more, click the image.
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    The Zodiac Atlas: The Zodiac Killer Enigma by Randall Scott Clemons. Click image for details.
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    The Zodiac Killer Map: Part of the Zodiac Killer Enigma by Randall Scott Clemons. Click image for color version
    For black and white issue..
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