Solved Idaho cold case leaves Chicago Tylenol murders open

By Daniel Okafor · Reporting from New York · September 24, 2026

Forty-three years after an anonymous suicide in Boise, detectives named Dr. Mathew Francis Betkouski, but proof tying him to the Tylenol poisonings remains absent.

A nameless man in a Boise church pew

On December 4, 1982, a man sat inside Sacred Heart Catholic Church in Boise, Idaho, and ended his life with cyanide. He carried no identification and an empty wallet. He possessed an ink marker, a lighter, a wristwatch, a leather belt with a distinctive buckle, a bolo tie, and keyrings with nearly 30 keys, CBS News reported. He had an envelope containing $1,900 and a typed note signed "William L. Toomey," a false name.

His fingernails were filed, his hair dyed, and his pants freshly pressed. His deep tan indicated he lived somewhere warm, police stated. Detective Frank Richardson worked the case for decades until his retirement. Detective Tim Cooper of the Ada County Sheriff's Office reopened the case in 2019.

Cooper identified a key from a hardware store in Jacksonville, Florida, with a specific etching. The etching led Cooper to Mills Court in Jacksonville, where property deeds from the late 1970s and 1980s showed a man reported dead in 1989 owned a property. A brother in Los Angeles confirmed the man lived in Jacksonville until he went missing in 1982 and was later declared dead in absentia. DNA from the brother matched DNA from the wallet, Fox News reported.

Authorities posthumously identified the man as Dr. Mathew Francis Betkouski. Betkouski's grandfather served as president of the Los Angeles City Council and interim mayor, and his father was a senior official with the Los Angeles Department of Water and Power. Betkouski suffered a traumatic brain injury in 1974. He worked for a flavors and fragrances company in Jacksonville starting in 1975, where coworkers reported him for talking about suicide and how to commit the perfect crime with poisons, NBC 5 Chicago reported.

Betkouski received two months of psychiatric care in Los Angeles in 1978 and was fired from his Jacksonville jobs. He spent more than a month in psychiatric treatment at a Florida state hospital after his mother died in 1979. His personal writings mentioned managing depression and schizophrenia and "imaginary thoughts of violence" to achieve euphoria, ABC7 Chicago reported. Lockheed hired Betkouski in late 1979 to work at a test facility in White Sands, New Mexico. Scientists there recalled Betkouski talking about introducing poison into over-the-counter medication capsules. Lockheed fired him in March 1982 following an altercation at a pharmacy where he allegedly tried to obtain capsules for an experiment. Police found Betkouski conducting experiments in his home garden.

Can maps and poison bridge forty years?

The coroner ruled Betkouski's cause of death as cyanide poisoning. In 2021, Idaho police found a hand-drawn map of Chicago, letters, and photos of Betkouski in the Chicago area in his childhood bedroom in Los Angeles. Police believe he drew the map in the 1970s. Photos of Betkouski in Chicago were likely taken in December 1981, Fox News reported. Police found a small bottle of homemade sodium cyanide made from peach and apricot pits. The Chicago Tylenol murders involved potassium cyanide.

Ada County Sheriff's Office investigators cannot place Betkouski in Chicago during the final week of September 1982, when seven people died after taking cyanide-laced Tylenol capsules in the Chicago area. Tylenol victims included Mary Kellerman of Elk Grove Village, Adam Janus of Arlington Heights, Stanley Janus and Theresa Janus, Mary Reiner of Winfield, Mary McFarland of Lombard, and Paula Jean Prince of Chicago's Old Town. Johnson & Johnson executive Wayne Nelson called it a clear case of indiscriminate murder. Johnson & Johnson cleared Tylenol shelves nationwide. Chicago Mayor Jane Byrne banned Tylenol sales in Chicago.

James Lewis was the prime suspect in the Tylenol murders, sending an extortion letter to Johnson & Johnson demanding $1 million. Lewis spent over a decade in prison for attempted extortion and died in July 2023 in Cambridge, Massachusetts.

"While our office may have identified some connection to 1982 events, we're not naming him as a suspect," said Detective Cooper. "Our goal today is to generate new leads to this case and possibly others," Cooper said, according to CBS News. The Ada County Sheriff's Office shared evidence with the Chicago Police Department. Chicago Police Department detectives have been in contact with the Ada County Sheriff's Office regarding its investigation to determine whether there is a connection to the Tylenol murders investigation, which remains an open cold case, the Chicago Police Department wrote in a statement. The Arlington Heights Police Department reviewed the information and continues to work to identify those responsible for the 1982 Tylenol murders.

"There have been repeated claims over the past 44 years about alleged links to the Tylenol murders which have remained unsubstantiated," the FBI Chicago office wrote in a statement. "Out of respect for the ongoing, legitimate investigation, those impacted by the tragedy, and the law enforcement partners who have provided genuine support since the start, the FBI remains the lead on investigating and releasing credible information to the public once the evidence yields a true case resolution."

The evidence stops where the proof begins

Putting a name to a dead man does not place him at a crime scene. Modern science recovers lost identities, but it cannot manufacture presence.

Betkouski left behind a chilling profile. He talked about poison. He worked as a chemist. He made homemade cyanide from peach and apricot pits in his garden. He visited Chicago in December 1981, and investigators found a hand-drawn map of the city among his childhood things in Los Angeles, Fox News reported. The Tylenol murders involved a chemist with a fixation on the perfect crime using cyanide to poison over-the-counter medication capsules, and Betkouski possessed that exact technical obsession in the autumn of 1982.

Yet the evidentiary gap remains absolute. Ada County investigators acknowledge they cannot place Betkouski in Chicago during the final week of September 1982 when the poisonings occurred. The poison he brewed was sodium cyanide derived from fruit pits, while the capsules that killed Mary Kellerman and six others contained potassium cyanide. James Lewis spent a decade in prison for extortion and lived as the primary suspect until his death in 2023, yet authorities never charged him with the murders because the physical link was missing. Betkouski presents the same dead end. A name, a history of mental illness, and a scrapbook of disturbing thoughts do not make a murderer without a single footprint inside an Illinois pharmacy in the fall of 1982.

Law enforcement agencies are right to share files and review every artifact, but the facts dictate the judgment. Dr. Mathew Francis Betkouski is Boise's identified wanderer, not Chicago's Tylenol killer, and until evidence bridges a continent and a calendar week, the murders remain an open cold case.

Solved Idaho cold case leaves Chicago Tylenol murders open

A nameless man in a Boise church pew

Can maps and poison bridge forty years?

The evidence stops where the proof begins

Sources