No. The Zodiac Killer has never been caught. More than 55 years after the attacks in Northern California between 1968 and 1969, no one has been arrested, charged, or convicted, and the FBI confirmed as recently as 2021 that the investigation is still open.1FBI. FBI – Zodiac Killer Dozens of suspects have been floated over the decades. None has been confirmed by law enforcement, and the physical evidence has excluded the most prominent ones.
Why the Case Is Still Active
Several agencies have kept files on the Zodiac. The San Francisco Police Department, the Vallejo Police Department, and the Napa County Sheriff’s Office each handled different attacks, and the FBI’s San Francisco field office has repeatedly stated the investigation remains open and unsolved.1FBI. FBI – Zodiac Killer The SFPD has investigated an estimated 2,500 suspects. Its specific file on the Paul Stine murder was administratively closed in 2004, but the broader investigation never shut down.
California has no statute of limitations for murder, so the case can be pursued indefinitely no matter how much time has passed.2San Francisco Police Department. Homicides and Cold Cases Cold case units re-examine the original files, witness statements, and forensic evidence as new techniques become available.
The confirmed count is five murders and two surviving victims across four attacks in the Bay Area: Betty Lou Jensen and David Faraday on Lake Herman Road in December 1968; Darlene Ferrin (killed) and Michael Mageau (survived) at Blue Rock Springs Park in July 1969; Cecelia Shepard (killed) and Bryan Hartnell (survived) at Lake Berryessa in September 1969; and taxi driver Paul Stine in San Francisco in October 1969. The Zodiac himself claimed 37 murders in letters to the press, a number that has never been corroborated.
Why DNA Has Not Closed the Case
The strongest physical evidence investigators have is saliva recovered from beneath stamps on the Zodiac’s letters. In the early 2000s, the SFPD crime lab developed a partial DNA profile from those traces. Partial is the operative word. The profile is complete enough to exclude someone as the source but not complete enough to identify anyone.
That matters because the technique that cracked the Golden State Killer case in 2018, investigative genetic genealogy, depends on uploading a DNA profile to public genealogy databases and finding relatives who share enough markers to build a family tree. With a full profile, investigators can narrow down to a single person. With the Zodiac’s fragmentary profile, too many people could match, which makes it nearly impossible to isolate a single family line.
There are open questions about the DNA itself. Detectives have debated whether the saliva actually came from the Zodiac or from someone else who handled the letters. Not all authenticated letters have been tested, and some evidence held by the Vallejo Police Department went unanalyzed for years. If a more complete profile could be extracted from untested material, the picture changes. Whether that testing has happened has not been disclosed. If the SFPD has produced a full genetic profile, it has not said so publicly.
Time works against the evidence. DNA degrades, and material pulled from 50-year-old adhesive is hard to sequence. Processing the stamps for fingerprints decades ago can significantly reduce recoverable DNA. Lab techniques now handle smaller and more degraded samples than they could even ten years ago, but there are physical limits to what any technology can extract from evidence this old.
Suspects Who Have Been Named and Dismissed
Dozens of individuals have been proposed as the Zodiac. None has been confirmed, and most have been formally excluded.
For years the most prominent suspect was Arthur Leigh Allen, a convicted sex offender from Vallejo who drew police attention in the early 1970s based on circumstantial evidence. The case against him collapsed on forensic grounds. In 2002, the partial DNA profile from the Zodiac’s letters did not match Allen’s DNA. His fingerprints did not match prints recovered from the Paul Stine scene, and handwriting experts concluded he did not write the Zodiac’s letters. Allen died in 1992 without ever being charged. The Vallejo Police Department has said it still considers him a suspect alongside other theories, but the physical evidence has excluded him.
In October 2021, a group calling itself the Case Breakers, led by former FBI officials and retired law enforcement officers, publicly identified a deceased Air Force veteran named Gary Francis Poste as the Zodiac. The group cited circumstantial evidence including a forehead scar that it said matched a police sketch and alleged links to the 1966 murder of college student Cheri Jo Bates in Riverside. The FBI responded that “the case remains open and there is no new information to report.” No law enforcement agency confirmed the identification, and the Riverside Police Department has maintained that Poste was not connected to the Bates case. Poste died in 2018.
In December 2025, investigator Alex Baber put forward another theory, claiming a man named Marvin Margolis was responsible for both the Zodiac killings and the 1947 Black Dahlia murder. The claim reportedly relied on handwriting comparisons and circumstantial geographic evidence. Margolis’s family has denied the allegations, and no law enforcement agency has confirmed the theory. The FBI was reportedly reviewing the material, which is routine when new claims come in and does not indicate the agency finds a theory credible.
The pattern repeats every few years. An independent investigator or group announces a breakthrough, media attention surges, and law enforcement declines to confirm. The distance between private theories and prosecutable evidence has stayed enormous.
What About the Ciphers?
Three of the four ciphers the Zodiac sent to Bay Area newspapers have been decoded, and none has produced the killer’s identity. The 408-character Z408 cipher was solved within a week of its August 1969 publication by Donald and Bettye Harden, a schoolteacher couple from Salinas, California. The 340-character Z340 resisted every attempt at decryption for 51 years until December 2020, when a trio of amateur codebreakers finally cracked it and the FBI confirmed the solution. The decoded message was a taunt and contained no identifying information.
Two shorter ciphers, Z13 and Z32, remain officially unsolved. The Zodiac claimed Z13 contained his real name, but at only 13 characters the text is so short that countless solutions are mathematically possible. In 2021, French engineer Fayçal Ziraoui publicly claimed to have decoded both remaining ciphers. Neither the FBI nor the SFPD has commented on or confirmed his work. The two ciphers that could theoretically reveal the killer’s identity are still unbroken.
Could the Case Ever Be Closed Without a Trial?
Given the time elapsed, there is a strong probability the Zodiac died long ago. Someone who was 20 in 1969 would be in their late 70s today, and most serious suspect theories involve individuals who are already deceased.
Identifying a dead suspect would not produce a trial, but it could still formally resolve the case. The FBI uses a category called exceptional clearance for cases where investigators have identified the offender, gathered enough evidence to support an arrest, and know the suspect’s location, but something outside law enforcement’s control, such as the offender’s death, prevents prosecution.3FBI’s Uniform Crime Reporting (UCR) Program. Offenses Cleared – Crime/Law Enforcement Stats All four conditions must be met. Simply suspecting someone who has died does not qualify.
For an exceptional clearance to happen, investigators would most likely need a complete DNA profile matched through genealogy, or new evidence surfacing from untested materials. The tools are better than they have ever been. Whether the evidence has survived in usable form long enough to use them is the question that keeps the case open.