A mystery that’s spanned more than four decades may be one step closer to being solved, thanks to cold case detective work out of Idaho.
Download the Straight Arrow app today to get the stories that matter free from manipulation, bias or agenda.™
Point phone camera here
Investigators with the Ada County Sheriff’s Office announced in a news conference Wednesday that they’ve gotten a new break in the unsolved murders of seven people via cyanide-tainted Tylenol capsules in 1982. It all started when a detective reopened a 1982 cold case in 2019. What began with the investigation into an unidentified body found in a Boise church led authorities more than 2,500 miles away to Florida before being linked back to the Chicago murders.
During the span of three days beginning Sept. 29, 1982, seven people, including a 12-year-old girl, died after taking cyanide-laced Tylenol in the Chicago area. It triggered a nationwide recall and led to the adoption of tamper-proof packaging for over-the-counter medications.
Idaho’s ‘Unknown Wanderer’
In December 1982, a man’s body was found in the Sacred Heart Catholic Church in Boise. He has no identification on him, but investigators say sweat marks in his empty wallet showed where cards had once been placed.
They say the man — who they dubbed “Unknown Wanderer” — was clean, well-groomed and wearing clothes that looked new, along with a distinctive bolo tie and belt buckle. He also had two key rings with nearly 30 keys on them.
Police also said the man had a deep, even tan, like someone who’d been living somewhere warm — that’ll be relevant in a moment.
Investigators worked the case for years but couldn’t match his fingerprints in any databases. They traced his bolo tie to a silversmith in the Southwest, but that turned out to be a dead end.
While examining evidence, cold case detective Tim Cooper found markings on one of the keys linking it to a hardware store in Jacksonville, Florida. That eventually led him to a specific street, and he was able to use property records to identify a property that had been abandoned until its owner was reported dead in 1989.
Cooper tracked down the owner’s only surviving family member, who confirmed his brother lived in Jacksonville until he went missing in 1982 and was declared dead in absentia years later. Using the brother’s DNA, investigators were finally able to identify the man who died in the Idaho church some 40 years earlier as Dr. Mathew Francis Betkouski.
Who was Dr. Mathew Francis Betkousi?
Investigators say Betkouski came from a prominent Los Angeles family. His grandfather had been president of the city council and had even served as interim mayor, and his father was a senior official with the Los Angeles Department of Water and Power.
They say Betkouski was an organic chemist who had a documented fascination with chemistry and explosives and was known to talk about poisons — cyanide, in particular. He struggled with mental illness throughout his life, worsened by a traumatic brain injury in 1974.
Betkouski moved to Jacksonville in 1975 to work for a flavors and fragrances company, where coworkers raised concerns with management.
“After about three years, concerns mounted after coworkers reported Dr. Betkouski discussing the ‘perfect crime’ and how cyanide could be used as a less messy means of taking one’s life,” Cooper said.
He was subsequently fired from his Jacksonville job.
In late 1979, Betkouski was hired to work at the Lockheed Martin test facility in White Sands, New Mexico. A fellow scientist there said Betkouski had talked about how poison could be introduced into over-the-counter medication capsules.
“It was said that Dr. Betkouski attempted to obtain some type of pills or capsules from a pharmacy in the Las Cruces area and said this would be for an ‘experiment,’” Cooper said.
He was fired in March 1982 after he caused a disturbance at that pharmacy, and it was discovered that he had been taking home unauthorized materials from his job.
Why is he being linked to the Tylenol murders?
Betkouski’s brother died in 2021, and his family member let Idaho police look through his L.A. home. Cooper says they found photos, letters and a hand-drawn map of Chicago they believe was made in the 1970s, as well as a small bottle of cyanide with a handwritten label.
Cooper did note that the bottle contained sodium cyanide, not the potassium cyanide used in the Chicago Tylenol poisonings. They believe Betkouski made the sodium cyanide himself after testing showed that the bottle contained peach and apricot pits.
Fear No Fact.
The 1982 Tylenol murders triggered the first nationwide mass recall in U.S. history, involving more than 31 million bottles and costing Johnson & Johnson roughly $100 million.
Police also said they found writings showing Betkouski had an interest in visiting Chicago. They also found photos of him in the Chicago area, which they initially thought were taken in late 1982 but likely were taken in December of 1981.
Police say they don’t know if Betkouski returned to Chicago after the photos were taken, and they cannot place him there in the final week of September 1982, when the Tylenol murders happened. Because of that, Betkouski is not an official suspect in the Chicago case.
“While our office may have identified some connection to 1982 events, we’re not naming him as a suspect,” Detective Cooper said. “Our goal today is to generate new leads to this case and possibly others.”
Cooper also noted that Betkouski was found dead just three months later after having apparently taken steps to hide his identity. The coroner ruled he took his own life with cyanide.
Idaho investigators say they’ve shared everything they found that could be related to the Chicago Tylenol murders 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 said in a statement, according to CBS News. “Anyone with information that may assist in this investigation is asked to submit an anonymous tip through CPDTip.com or Cook County Crime Stoppers at 800-535-7867.”
Tainted Tylenol capsules, laced with cyanide, lay at right beside the pure capsules, in the medical examiner’s office in Cook County, Illinois. 
Tylenol, a brand of painkiller regularly used in the United States of America, is found to be responsible for the death of four people in two days. (Photo by Bernard Bisson/Sygma via Getty Images) 
OCT 11 1982, Bottles and Boxes of Tylenol products which were taken off the shelves or retuned to the Safeway store at Sixth and Corona. The bottle with the skull and crossbones was marked by someone who returned the bottle to the store. (Denver Post via Getty Images) 
Close-up of the new tamper-resistent Tylenol packaging brought about by Tylenol capsules being laced with cyanide after production.
Dr. Park Dietz, a forensic psychiatrist who was consulted during the original Tylenol murders investigation, also reviewed the evidence Cooper found. Dietz said he and groups of forensic psychiatrists, psychologists and criminal profilers who were anonymously presented with information about Betkouski overwhelmingly consider him a viable suspect in the Chicago case.
“It’s an extraordinary thing to have been around at the beginning in 1982, and now today in 2026, to see very likely closure,” Dietz said during Wednesday’s press conference.
The other suspects
In 1982, investigators identified a couple of suspects in connection with the murders, but no one was ever charged.
One man, Roger Arnold, was arrested in October 1982 after he told fellow patrons at a bar that he had cyanide in his home for a “project” he was working on, according to the Chicago Tribune. Detectives asked bartenders on Lincoln Avenue to give them a call the next time Arnold comes in for a drink.
Arnold was never charged in the Tylenol tampering case, but he was sentenced to 30 years in prison after fatally shooting a man he mistook for the bartender who alerted police to the comments he made about cyanide.
The main suspect in the case has long been James Lewis, who mailed an extortion letter to Johnson & Johnson days after the poisonings, promising to stop the killing if the company wired $1 million to a Chicago-based bank account. He also sent a letter to then-President Ronald Reagan threatening to plant more cyanide all over the country, the Tribune said.
Lewis also mailed three letters to the Chicago Tribune denying he tampered with the Tylenol.
Lewis served more than 12 years in prison for the attempted extortion. He was released in 1995 and died in 2023 without ever being charged in the murder case.
Round out your reading
- Lawyer says 57 Cornell frat members were in the group chat. Could their silence be a crime?
- Florida county discovers mysterious Flock cameras with no obvious owner.
- Off Script: They won their primaries on one message. Now it’s disappearing.
- Some question whether a popular affordable housing policy is making the nation’s home shortage worse.
- Kelvin wave incoming: Why the US should care.
