A private investigator using artificial intelligence technology has identified Marvin Merrill as the Zodiac Killer, a figure long sought in one of the United States’ most enduring criminal mysteries. The claim, announced in June 2026, adds a new dimension to investigations surrounding unsolved crimes from the late 1960s and early 1970s.

The Zodiac Killer is known for a series of brutal murders in Northern California between 1968 and 1969, in addition to taunting police and media with cryptic letters and ciphers. Despite numerous suspects and extensive investigations over the past five decades, the killer’s identity has never been conclusively established.

According to the AI researcher behind the recent claim, proprietary algorithms analyzing linguistic patterns, handwriting features, and historical data led to the identification of Marvin Merrill as the culprit. Merrill had not previously been a high-profile suspect in Zodiac cases, though the investigator suggests his profile fits the pattern of victims and behavior attributed to the Zodiac.

The AI sleuth also raised the possibility that Merrill may have been involved with the infamous Black Dahlia murder of Elizabeth Short in 1947, another high-profile unsolved case. This theory remains speculative, with no concrete evidence linking Merrill directly to the Black Dahlia case.

Law enforcement officials have yet to confirm or refute the AI-driven assertion, emphasizing that without physical evidence or official corroboration, the claim remains unverified. Some experts in criminal profiling and forensic analysis have expressed cautious interest, noting that while AI can offer valuable insights, traditional investigative methods remain essential for definitive conclusions.

The renewed focus on the Zodiac case comes amid growing use of artificial intelligence in criminal investigations, an approach that has sparked debate over reliability, ethics, and the potential to both solve and complicate cold cases.

As investigators weigh the findings, the claim attributing the Zodiac murders to Marvin Merrill underscores both the enduring public fascination with the case and the evolving methodologies in the search for justice.