Tylenol Murders Update: Idaho Man Found Dead 44 Years Ago Could Be Connected to Unsolved 1982 Case That Shocked Nation
One cold case could lead to the completion of another.
Oct. 7 2026, Published 3:00 p.m. ET
Investigators might be one step closer to solving the famous Tylenol Murders case from 1982.
Idaho law enforcement finally identified a man who poisoned himself with cyanide in a Boise church 44 years ago, and they suspect he may have been responsible for the string of unsolved murders, RadarOnline.com has learned.
Idaho Authorities Crack Cold Case Potentially Connected to Tylenol Murders
A man who took his life in an Idaho church was finally identified 44 years later.
After a member of the Boise church sought an update on the poisoned individual, investigators cracked the case back open in 2019. They were able to identify the man as Mathew Francis Betkouski, according to Ada County Sheriff’s Office Detective Tim Cooper.
Betkouski's personal life appeared to align with suspicions detectives had about the Tylenol murderer. Betkouski, named the "Unknown Wanderer" before being identified, was a Lockheed Martin organic chemist who also worked on NASA-related projects.
His deep understanding and interest in drug manufacturing could align with the expertise needed to pull off the Tylenol Murders. The Tylenol capsules that took the lives of six innocents were laced with cyanide, matching the very means Betkouski used to take his own life.
1982 Tylenol Murder Case Fell Cold
Netflix previously released a special on the cold case titled, 'The Tylenol Murders.'
The murders first began in later 1982 when Mary Kellerman, 12, died in the hospital after taking Tylenol capsules. Investigators noticed a connection when six more people under 35 died the same way in the Chicago area.
After discovering they were laced with cyanide, a recall was put on Tylenol across the nation.
However, Johnson & Johnson, the company that manufactures the product, determined the capsules were not laced within their plants or distribution centers, meaning someone was meddling with them externally and placing them back on the shelf for unsuspecting customers to buy.
Mathew Francis Betkouski Developed Pharmaceutical Obsession
The detectives identified some traits of the man which align with possible traits of a suspect.
Betkouski's career wasn't the only reason investigators became curious about his potential connection to the Tylenol murders.
After a brain injury in 1974 from falling off a fence, he began to show signs of odd behavior and mental illness. He spent time in inpatient and outpatient psychiatric treatment.
According to Detective Cooper, Betkouski developed a fascination with chemistry and explosives and had a sharp mind.
During his time in New Mexico, Betkouski tried to obtain capsules from a pharmacy in 1982, but police were called to escort him home. They discovered he was stealing material from his lab and found him with cyanide, which he told coworkers could be used to pull off the "perfect crime."
Ultimately, he was fired from his position, despite efforts to curb his behavior through mental health treatment.
Just two weeks before the Tylenol murders began, Betkouski made calls to chemical supply and pharmaceutical companies in Pennsylvania.
The content or intent of those phone calls was not disclosed, but the timing of events left investigators suspicious. Even his death occurred around the time frame of the murders. He sold his car and possessions before disappearing.
Missing Pieces Still Remain
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Mathew Francis Betkouski is believed to be connected to the unsolved Tylenol murders.
A missing point in their investigation involves a possible confession at the church. Investigators suspected he offered a final confession to a priest before poisoning himself at a pew, but the priest did not offer a statement.
"We have heard various things that may have been said or done in the church that day, and some are interesting," Cooper said. "But in the end, we cannot independently verify what was or wasn't said in the confessional on the day Betkouski died."
However, Ada County Sheriff Matt Clifford couldn't determine definitively if Betkouski was the culprit, as the Tylenol murders were outside of their jurisdiction in Boise.
"We sent all our information to the Chicago area. It's really not our job to name him as a suspect," he told the press. "What we are looking for is … Do you have any information?"
