Investigators have identified the man known for decades as Idaho's "Unknown Wanderer" as Dr. Mathew Francis Betkouski after reopening a 1982 cold case. A marked key led detectives to Jacksonville property records, which helped them locate a brother whose DNA matched genetic material from the deceased's possessions. Betkouski worked in Jacksonville and later at Lockheed Martin; he was dismissed in 1982 amid concerns about an obsession with poison. Authorities say they are not naming him a suspect in other 1982 poisonings but hope the identification generates new leads.
Idaho Cold Case Closed: 'Unknown Wanderer' Identified as Dr. Mathew Francis Betkouski After 43 Years
Identity of Idaho's Dead "Unknown Wanderer" Solved After 43 Years
After more than four decades, investigators have identified the man long known to true-crime followers as the "Unknown Wanderer." Authorities announced at an Ada County Sheriff's Office press conference on Sept. 23 that the body found inside a Boise church in December 1982 has been linked to Dr. Mathew Francis Betkouski.
Breakthrough From a Small Clue
Detective Tim Cooper reopened the cold case in 2019 and focused on a seemingly small but crucial item: a key found among the deceased man's belongings. The key bore markings tying it to a hardware store in Jacksonville, Florida, and an etching that pointed Cooper to Mills Court in Jacksonville.
Records, Family, and DNA
Property deeds from the late 1970s and early 1980s at that address included the name Betkouski. Investigators discovered Betkouski had been declared dead in 1989 and traced a living brother in Los Angeles, who reported Mathew missing in 1982. DNA from the brother was compared with genetic material recovered from the deceased man's possessions — which included two keyrings holding nearly 30 keys, a wallet with no identification cards and an envelope containing close to $2,000 — and provided the link confirming the identity.
Darin Oswald/Idaho Statesman/Tribune News Service via Getty Images
Background And Ongoing Inquiries
Authorities say Betkouski came from a prominent Los Angeles family, moved to Jacksonville in 1975 to work in the flavors-and-fragrances industry, and later worked as a scientist at Lockheed Martin. Police have said he was dismissed from his job in 1982 after supervisors expressed concern about an obsession with poison and about placing substances into pill capsules.
"While our office may have identified some connection to 1982 events, we're not naming him as a suspect," Detective Tim Cooper said during the Sept. 23 press conference. "Our goal today is to generate new leads to this case and possibly others."
Context And Public Interest
The case had previously drawn national attention: the man's death was featured in a 1990 episode of the television series Unsolved Mysteries. Earlier efforts to match the Unknown Wanderer's fingerprints to Idaho or FBI records were unsuccessful; the recent combination of traditional detective work, property records and familial DNA finally closed the identification gap. Authorities emphasize they are not linking Betkouski to other high-profile poisonings at this time but hope the identification generates new leads.
What investigators want now: any new witnesses, records, or information that could explain Betkouski's movements in 1982 and the circumstances that led to his death.
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