Idaho Identifies 1982 Suicide Victim in Tylenol Murders Probe

Ada County, Idaho, investigators said Wednesday they have identified a man who died by cyanide poisoning inside a Boise church in December 1982, and they are examining whether he had any connection to the unsolved Tylenol murders in Chicago that same year, according to the Ada County Sheriff's Office.

Who was the "Unknown Wanderer"?

The man died inside Sacred Heart Catholic Church in Boise on Dec. 4, 1982, and carried no identification. For decades he was known only as the "Unknown Wanderer" in case files, NBC News reported. The Ada County Sheriff's Office determined the cause of death was cyanide poisoning and classified it a suicide.

How did investigators identify him?

Detectives reopened the case in 2019. Cold case detective Tim Cooper found an engraved key among the man's belongings that traced to a residence in Jacksonville, Florida, according to the sheriff's office. That lead helped Cooper identify the man as Dr. Mathew Betkouski. Cooper also reviewed thousands of documents, including Betkouski's personal writings, as part of the identification work.

Is there a confirmed link to the Tylenol murders?

No evidence has surfaced placing Betkouski in the Chicago area at the time of the 1982 Tylenol poisonings, which killed seven people who had taken extra-strength Tylenol capsules laced with cyanide, the sheriff's office said. The suspected connection rests on reported behavioral and professional details rather than physical or geographic evidence: colleagues recalled Betkouski as fixated on the idea of a "perfect crime" and on cyanide as an undetectable killing method, according to the sheriff's office. Investigators have not said whether forensic testing links any cyanide samples between the two cases.

What is known about Betkouski's background?

Betkouski came from a prominent Los Angeles family and trained as a chemist, Cooper said at a Wednesday news conference. He worked in two drugstores and, starting in 1975, spent three years at a flavors and fragrances company in Florida before leaving for psychiatric treatment in Los Angeles. The sheriff's office described him as having a "history of volatility." Cooper said Betkouski suffered a traumatic brain injury in 1974 that "caused some of his problems to manifest in more concerning ways than they had before," and that he had lifelong struggles with mental illness and difficulty connecting with people.

What happens next in the investigation?

The sheriff's office has not announced a timeline for further findings and has stopped short of naming Betkouski a suspect in the Chicago poisonings, which remain officially unsolved more than four decades later. Cooper's identification closes the Idaho "Unknown Wanderer" case; whether it opens new ground in the Tylenol investigation depends on evidence yet to be produced.

Glossary

• Cold case unit: A law enforcement division that re-investigates unsolved crimes using new technology or leads not available at the time of the original inquiry.
• Cyanide poisoning: Death or injury caused by a fast-acting chemical compound that blocks the body's ability to use oxygen; the method used in both the Boise death and the 1982 Chicago poisonings.
• Unidentified decedent case: A death investigation in which the deceased person's identity is unknown, often tracked using physical evidence, dental records, or, as in this case, personal effects such as an engraved key.