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The Zodiac Killer Letters: An Analysis of Language, Strategy, and Signature

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August 23, 2026

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Required Reading

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Letters - Transcribed

July 31, 1969 - Vallejo Times Herald
July 31, 1969 - San Francisco Chronicle
July 31, 1969 - San Francisco Examiner
August 1969 "Debut Letter" - San Francisco Examiner
October 13, 1969 - San Francisco Chronicle
November 8, 1969 - San Francisco Chronicle
November 9, 1969 - San Francisco Chronicle
December 20, 1969 - Melvin Belli
April 20, 1970 - San Francisco Chronicle
April 28, 1970 - San Francisco Chronicle
June 26, 1970 - San Francisco Chronicle
July 24, 1970 - San Francisco Chronicle
July 26, 1970 - San Francisco Chronicle
October 27, 1970 - Paul Avery of San Francisco Chronicle (Images Only)
March 13, 1971 - Los Angeles Times
March 22, 1971 - San Francisco Chronicle (Images Only)
January 29, 1974 - San Francisco Chronicle
February 14, 1974 - San Francisco Chronicle
May 8, 1974 - San Francisco Chronicle
July 8, 1974 - San Francisco Chronicle
May 2, 1978 - KHJ TV

Profiling

A Working Profile of the Zodiac Killer

Victimology
Linguistic / Communication
Geographic
Behavioral / Signature
Physical / Forensic Awareness
Timeline / Opportunity

Core Analysis

Zodiac: A Name Anchored in the Bay
Writing for Print
Quantity of Stamps and the Zodiac Killer's Dozen
The Decoy Effect
The Halloween Card as a Structured Narrative: A Reassessment of Zodiac’s Intent
The Victim Count Assumption
Part 1 - Coveting Control: The Emotional Engine Behind the Zodiac's Crimes
Part 2 - Victim vs. High-Profile: What the Zodiac Coveted and Why
Part 3 - The Survivor's Divide: Why The Zodiac Wrote After Mageau, But Not Hartnell
Part 4 - When Violence Meets Art
Part 5 - Inscribed Control: The Zodiac's Car Door as A Manifestation of Psychological Dominance
The Zodiac Cipher Symbols
Cryptography: Behind the Layers of the Zodiac Killer's Deception
408 Cipher Revisited: Tracking the Pieces Through Language and Error
The Zodiac Killer z32 Cipher and the Rule of Three
Ciphers of Control: How the Zodiac Orchestrated Obsession
A Humorous, Self‑Referential Reading of the Z13
Decoding the Exorcist Letter: Zodiac’s Symbols as a Hidden Map of the Bay Area
The Geometry of Flight: Zodiac’s Movements Mapped Through Cartesian Logic
The Zodiac Killer's Movement: The Road Between Crime and Comfort
Under the Surface: The Dripping Pen as a Nautical Clue

Forensic Analysis

Ink and Writing Instrument Analysis

Cryptography

The Zodiac Cipher Symbols
Cryptography: Behind the Layers of the Zodiac Killer's Deception
408 Cipher Revisited: Tracking the Pieces Through Language and Error
The Zodiac Killer z32 Cipher and the Rule of Three
Ciphers of Control: How the Zodiac Orchestrated Obsession
A Humorous, Self‑Referential Reading of the Z13

Associated Cases

Case 1 (Nothing Added Yet)
Case 2 (Nothing Added Yet)

Coming Soon

The Typography of Flight: The Inner Logic of Zodiac’s Hiding Place

Media Links

David Oranchak - Cryptography
Dion Walker - Understanding FBI Documents (Currently Disabled Channel)
ShakeDogShake - Zodiac Killer Research
Sheldon Solomon - Any YouTube video will do. (He's fantastic)
Richard Grinell - Zodiac Ciphers Blog (More than just ciphers)
Other Media Links

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