The Zodiac case is easy to mythologize and hard to organize. This timeline keeps the core chronology straight: the confirmed attacks, the letters, the ciphers, and the questions investigators still have to separate from decades of rumor.
A useful Zodiac Killer timeline starts with the evidence-supported sequence, then marks where the file becomes contested. These are the events to know before evaluating any suspect theory.
The first widely accepted Zodiac attack happens near Benicia, California, when the two teenagers are shot beside a parked car. The case does not yet have a public name, but it becomes the starting point for the canonical timeline.
A gunman attacks Ferrin and Mageau in a parked car in Vallejo. Mageau survives and gives investigators one of the case's most important early eyewitness accounts.
Three newspapers receive letters claiming responsibility for the Lake Herman Road and Blue Rock Springs attacks. Each envelope includes part of a 408-symbol cipher and a demand for front-page publication.
A private couple solves the first cipher within days. The message reveals the writer's theatrical motive language, but it does not identify the killer by name.
A hooded attacker binds and stabs the college students near Lake Berryessa. Hartnell survives; Shepard dies two days later. The killer leaves writing on Hartnell's car door connecting the attack to earlier dates.
Paul Stine is shot in Presidio Heights. The later mailing of a piece of Stine's shirt creates one of the strongest links between the street crime and at least some of the Zodiac correspondence.
The writer sends a greeting card containing the now-famous Z340 cipher. It becomes one of the longest-running puzzles in American crime history.
Additional letters, cards, threats, and claimed victim counts keep the case in public view. The harder investigative question becomes separating authentic Zodiac evidence from possible hoaxes, exaggerations, and copycat noise.
A team of private codebreakers cracks the 340-character cipher after 51 years. The solution renews interest in the case, but it does not provide the offender's identity.
The Zodiac case remains a study in partial answers: survivors, letters, ciphers, fingerprints, ballistics, and suspect theories all exist, but no publicly accepted evidentiary package has closed the case.
Lake Herman Road, Blue Rock Springs, Lake Berryessa, and Paul Stine form the backbone of the case. Start here before weighing disputed claims.
The correspondence made the case famous, but not every later letter carries the same evidentiary weight. Treat confirmed, disputed, and hoax material separately.
Mike Mageau, Bryan Hartnell, and Presidio Heights witnesses shaped the suspect profile, but each account came from a different setting and stress level.
Fingerprints, handwriting, ballistics, and possible DNA remain the gap between a compelling theory and a provable identification.
The October 1969 Paul Stine murder is often treated as one of the most important events because the later shirt-piece mailing strongly links a physical homicide scene to the letter writer.
No publicly accepted law-enforcement identification has closed the case. Many suspects have been proposed, but none has produced a conclusive public evidentiary match.
The two most famous solved ciphers, the 408 and Z340, did not provide a confirmed identity. Their value is mainly in motive language, authorship, and investigative context.
CaseClosed turns static timelines into structured case files: evidence threads, suspect notes, theory boards, and a community of investigators comparing what the record actually supports.