Ada County authorities have identified the man who died of cyanide poisoning inside a Boise church on Dec. 4, 1982, as Dr. Mathew Francis Betkouski, an organic chemist formerly known as the "Unknown Wanderer." DNA from his wallet and a key traced to Jacksonville confirmed his identity. Items recovered from family storage — including a Chicago map and a bottle labeled sodium cyanide — and expert blind reviews renewed interest in a possible link to the 1982 Chicago Tylenol poisonings, though officials say they cannot place him in Chicago during the fatal week and stress no definitive tie has been proven. Investigators have handed their findings to Chicago authorities and are seeking tips about Betkouski's 1982 movements.
Cold Case Break: Idaho 'Unknown Wanderer' Identified as Chemist; Possible Link to 1982 Tylenol Killings Investigated
Three caskets are carried into St. Hyacinth Catholic Church in the Avondale neighborhood for the funeral of Adam, Stanley and Terri Janus, all victims of poisoned Tylenol.Chicago Tribune / Getty Images
The Ada County Sheriff's Office in Boise has identified the man long known as the "Unknown Wanderer" who died of cyanide poisoning inside Sacred Heart Catholic Church on Dec. 4, 1982. Authorities this week named him Dr. Mathew Francis Betkouski, an organic chemist whose identity remained a mystery for more than four decades.
Key Facts
Betkouski entered the church without identification and died there of cyanide exposure. At the time, his fingerprints produced no match. Investigators later traced one of nearly 30 keys found on him to Jacksonville, Florida, and a DNA sample taken from material in his wallet matched DNA provided by his brother — confirming his identity.
Why Investigators Revisited The Case
Officials say aspects of Betkouski's background and possessions prompted renewed attention to the unsolved 1982 Chicago Tylenol poisonings. Among the items found in family storage in Los Angeles were a map of Chicago and a bottle labeled as sodium cyanide. Investigators emphasized the sodium cyanide recovered was not the same type used in the Tylenol poisonings and that no definitive connection has been established.
Colleagues recalled Betkouski discussing cyanide and musing about the idea of a "perfect crime." Another scientist remembered him suggesting that poison could be introduced into over-the-counter capsules. Photos in his effects indicate he visited Chicago at least once, likely in December 1981, months before the Tylenol attacks.
Forensic Review And Limitations
Forensic psychiatrist Dr. Park Dietz, who consulted on the original Tylenol investigation, later oversaw an anonymous, blind review of the evidence. A panel of forensic psychiatrists, psychologists and criminal profilers overwhelmingly considered Betkouski a viable suspect in that review. However, officials said they cannot place him in Chicago during the final week of September 1982, when the Tylenol-related deaths occurred.
Timeline And Next Steps
- Oct. 15, 1982: Betkouski disappeared from his New Mexico home.
- Dec. 4, 1982: He died of cyanide poisoning inside Sacred Heart Catholic Church in Boise.
- Authorities report he had apparently altered his appearance before his death.
Ada County Sheriff Matt Clifford said investigators expect to learn more and have turned their findings over to Chicago-area authorities. Officials are asking anyone with information about Betkouski's movements or communications in 1982 to come forward.
"This isn't over," Sheriff Matt Clifford said, urging anyone with relevant information to contact investigators.
The investigation and identification were reported this week; the reporting notes the story was first published by Men's Journal. Officials caution that while the new identification has renewed scrutiny of possible links to the Tylenol case, no conclusive evidence tying Betkouski to those killings has been made public.
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