The Zodiac sent multiple ciphers to newspapers that took vastly different times to solve. One 408-symbol message yielded its text within a week. A 340-character cipher resisted all attempts for 51 years while a shorter 13-symbol version has never been cracked.
Key Takeaways
- The 408-symbol cipher (Z408) was solved by Donald and Bettye Harden on August 8, 1969.
- Z408 cipher solution revealed "I like killing people because it is so much fun."
- Zodiac's Z340 cipher remained unsolved for 51 years until December 2020.
- Zodiac claimed 37 victims in total across his letters.
- Zodiac claimed Riverside murder of Cheri Jo Bates in 1966.
- Zodiac claimed killing a man and woman near forest in Z408.
- Zodiac telephoned police after the Blue Rock Springs shooting to claim responsibility.
- The Zodiac sent his first letter with cryptograms to three newspapers on August 1, 1969.
- Zodiac sent over 20 confirmed letters between 1969-1974.
- Zodiac wore a hooded costume with a crossed-circle symbol at Lake Berryessa.
- Allen owned similar shoes to Zodiac's Wing Walker prints (size 10.5).
- Zodiac letter of November 8, 1969, included Paul Stine's bloody shirt piece.
- Over 2,500 suspects investigated by 2009.
- SFPD task force formed in 1969, disbanded 1972.
- Napa Sheriff reported 400 leads on Lake Berryessa alone.
After 1969 breakthroughs, Z408 and Z340 were decoded, while Z13 remains unsolved as the hunt continues.
Related reading
01 · Category
Ciphers14 stats
01
The 408-symbol cipher (Z408) was solved by Donald and Bettye Harden on August 8, 1969.
02
Z408 cipher solution revealed "I like killing people because it is so much fun."
03
Zodiac's Z340 cipher remained unsolved for 51 years until December 2020.
04
Z340 solved by David Oranchak, Jarl Van Eycke, and Sam Blake using AZdecrypt software.
05
Zodiac Z13 cipher remains unsolved as of 2023.
06
Z408 cipher contained 408 symbols, solved in 7 days.
07
Z340 cipher solution message was 340 characters long.
08
"My Name Is" cipher Z13 unsolved, 13 symbols.
09
Zodiac Z32 cipher sent with Mikado watch ad.
10
Zodiac mentioned Chinese zodiac animals in Z408.
11
Z340 solution referenced "tried to catch" and "slave."
12
Possible Z32 solution by Fayçal Ziraoui in 2021.
13
Zodiac's Z408 used homophonic substitution cipher.
14
54 symbols used in Z408 cipher.
Interpretation
Ciphers Interpretation
The Zodiac's ciphers read like a serial killer's twisted resume, boasting a solved 408-symbol manifesto, a 340-character taunt that took 51 years to crack, and a final, smug 13-symbol signature that remains his last laugh.
02 · Category
Claims3 stats
01
Zodiac claimed 37 victims in total across his letters.
02
Zodiac claimed Riverside murder of Cheri Jo Bates in 1966.
03
Zodiac claimed killing a man and woman near forest in Z408.
Interpretation
Claims Interpretation
The Zodiac diligently catalogued his 37 claims like a malevolent scorekeeper, yet his grisly accounting could never truly capture the human tragedy behind each numbered entry.
More related reading
03 · Category
Communications16 stats
01
Zodiac telephoned police after the Blue Rock Springs shooting to claim responsibility.
02
The Zodiac sent his first letter with cryptograms to three newspapers on August 1, 1969.
03
Zodiac sent over 20 confirmed letters between 1969-1974.
04
"Button Letter" sent July 26, 1970, with Bay Area Rapid Transit map.
05
Zodiac's "Exorcist Letter" referenced the movie in January 1974.
06
Final confirmed Zodiac letter "Red Phantom Letter" on July 8, 1974.
07
Zodiac called Vallejo police 40 minutes after Blue Rock Springs attack.
08
Zodiac taunted police with "This is the Zodiac speaking" phone calls.
09
Zodiac letter April 20, 1970, included cryptogram and bomb diagram.
10
Bates confession letter typed on Royal typewriter.
11
Vallejo Times-Herald received first cipher copies.
12
Zodiac bomb diagrams in letters detailed 18-step design.
13
"Dripping Pen Card" sent April 24, 1978, possibly Zodiac.
14
Confession letter for Bates threatened more murders.
15
Bloody shirt sent to three papers November 1969.
16
Zodiac's Halloween card 1970 had skeleton glyph.
Interpretation
Communications Interpretation
He mastered the art of the ominous press release, staging crimes for the news cycle with cryptograms for cover art, taunts as his signature, and bloody souvenirs for the morning edition, all while meticulously crafting his own monstrous mythology from a distance.
04 · Category
Evidence22 stats
01
Zodiac wore a hooded costume with a crossed-circle symbol at Lake Berryessa.
02
Allen owned similar shoes to Zodiac's Wing Walker prints (size 10.5).
03
Zodiac letter of November 8, 1969, included Paul Stine's bloody shirt piece.
04
DNA from stamps on Zodiac letters did not match Allen.
05
Zodiac used a .22 caliber weapon in first attack.
06
Blue Rock Springs used 9mm semi-automatic.
07
Lake Berryessa knife was a Western cutlery long blade.
08
Paul Stine killed with 9mm from same gun as Blue Rock Springs.
09
Lake Herman Road crime scene had 10 shell casings from .22 pistol.
10
Zodiac fingerprints from Stine cab did not match suspects.
11
Zodiac's crossed-circle symbol appeared 7 times on Hartnell's car door.
12
Desktop poem linked to Zodiac by some investigators.
13
Lake Herman Road tire tracks matched size 10 Wing Walker.
14
Zodiac's wing walker print had Electrid Brand tears.
15
Hartnell bound with precut plastic clothesline.
16
Zodiac wrote dates of murders on Berryessa door.
17
Stine cab had bloody print on door, partial thumb.
18
Vallejo police ballistics linked Blue Rock and Stine.
19
Bates' VW bug tires slashed to stage accident.
20
Seawater sample from Allen's car tested.
21
Zodiac typewriter identified as Olivetti.
22
FBI analyzed 100+ partial fingerprints.
Interpretation
Evidence Interpretation
The evidence paints a picture of a meticulous, taunting showman who left a frustrating trail of near-misses, where every compelling clue, from the shoes to the ballistics, seems to walk him right to the door only to have the fingerprints, DNA, and a maddening lack of a definitive 'smoking gun' slam it shut again.
More related reading
05 · Category
Investigation5 stats
01
Over 2,500 suspects investigated by 2009.
02
SFPD task force formed in 1969, disbanded 1972.
03
Napa Sheriff reported 400 leads on Lake Berryessa alone.
04
SFPD received 23 hoax Zodiac letters in 1969.
05
Napa task force chased 89 leads in 1969.
Interpretation
Investigation Interpretation
The Zodiac case is a dark testament to the fact that thousands of leads, hundreds of suspects, and even a dedicated task force proved no match for a killer who, with chilling efficiency, managed to drown the truth in a swamp of hoaxes and false promises.
06 · Category
Media9 stats
01
SF Chronicle published Z408 solution on August 9, 1969.
02
Over 40 books published on Zodiac case by 2023.
03
"Zodiac" film by David Fincher released 2007, grossed $70M.
04
Robert Graysmith's book "Zodiac" published 1986, sold 1M+ copies.
05
Zodiac killer case featured in 50+ documentaries.
06
Paul Avery's "Z" button led to Zodiac threat.
07
Chronicle hired bodyguard for Avery after threat.
08
Zodiac case generated 400+ news stories in 1969 alone.
09
"Zodiac Killer" Netflix docuseries viewed by 10M+.
Interpretation
Media Interpretation
The Zodiac's greatest crime was not his murders, but his spectacular, terrifying success in hijacking the public's imagination, creating a monster that now lives more vividly in our books, screens, and nightmares than he ever did in reality.
More related reading
07 · Category
Suspects9 stats
01
Arthur Leigh Allen was the primary suspect, named in 1969.
02
Handwriting analysis cleared Allen in 1972.
03
Allen searched 23 times by police between 1969-1992.
04
Gary Francis Poste named suspect by Case Breakers in 2021.
05
Poste had scars matching Zodiac description.
06
Mageau identified Arthur Leigh Allen in 1992 lineup.
07
Allen died of heart attack in 1992, age 58.
08
Arthur Leigh Allen lived 40 miles from crime scenes.
09
Allen watched Zodiac movie before death.
Interpretation
Suspects Interpretation
Despite being the prime suspect for decades, Arthur Leigh Allen was officially cleared by handwriting evidence, only to have the case's shadow chase him to his grave, then pivot to a new suspect decades later with the same eerie scars, proving the Zodiac's true identity remains a frustrating riddle wrapped in a movie night and a 40-mile radius of terror.
08 · Category
Timeline6 stats
01
Zodiac Killer's first confirmed attack occurred on December 20, 1968, at Lake Herman Road, Benicia, California.
02
On July 4, 1969, Darlene Ferrin, 22, was shot four times at Blue Rock Springs Golf Course.
03
Paul Stine, 29, taxi driver, shot once in the head on October 11, 1969, in San Francisco.
04
Lake Berryessa attack lasted 10 minutes.
05
Ferrin shot at 12:40 AM July 4, 1969.
06
Zodiac escaped on foot after Stine shooting.
Interpretation
Timeline Interpretation
The Zodiac, ever the inconsistent showman, offered a murderous buffet of locations, times, and methods, as if checking items off a twisted shopping list of infamy.
More related reading
09 · Category
Victims7 stats
01
David Arthur Faraday, aged 17, was the first confirmed victim, shot in the head.
02
Betty Lou Jensen, aged 16, received six point-blank shots during the Lake Herman Road attack.
03
Michael Mageau, 19, survived being shot four times in the Zodiac's second attack.
04
September 27, 1969, attack at Lake Berryessa involved Bryan Hartnell, 20, stabbed 6 times.
05
Cecelia Shepard, 22, was stabbed 10 times and died two days later.
06
Riverside Cheri Bates stabbed 4 times in heart.
07
Hartnell survived 22 days after stabbing.
Interpretation
Victims Interpretation
The grim pattern of the Zodiac's attacks reveals a disturbing escalation in violence, moving from gunshots to brutal, repetitive stabbings, yet it was the survivor, Bryan Hartnell, who endured for 22 days after being stabbed six times, that perhaps most painfully underscored the killer's calculated cruelty.
10 · Category
Witnesses9 stats
01
Hartnell identified Zodiac's height as 5'8" to 5'10".
02
Shepard described Zodiac's voice as deep, raspy before dying.
03
Three teenagers witnessed Stine murder, described white male 35-45.
04
Zodiac watched "The Most Dangerous Game" per Hartnell account.
05
Zodiac height estimated 5'8"-6'0" across witnesses.
06
Weight described as 180-200 lbs by multiple sources.
07
Glasses in composite sketch from Stine witnesses.
08
Napa composite showed crew cut hairstyle.
09
SFPD composite showed wide forehead.
Interpretation
Witnesses Interpretation
From a chorus of terrified voices, the composite that emerges is a man of unremarkable, medium build, whose only distinctive features were a chillingly deep voice and a wide, thoughtful forehead hiding a mind warped by a favorite hunting story.
Reference
Cite This Report
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APA
Diana Reeves. (2026, February 13). Zodiac Statistics. Gitnux. https://gitnux.org/zodiac-statistics
MLA
Diana Reeves. "Zodiac Statistics." Gitnux, 13 Feb 2026, https://gitnux.org/zodiac-statistics.
Chicago
Diana Reeves. 2026. "Zodiac Statistics." Gitnux. https://gitnux.org/zodiac-statistics.
Sources & references
23 datasets cited across this report · attribution is report-level