On the first Saturday of December 1982, a well-dressed stranger walked into Sacred Heart Catholic Church in Boise, Idaho, during the hours when the faithful come for confession. Sometime later, he was found dead between the pews.
He carried no identification. His wallet was empty, though sweat marks showed where cards had once been. In his pocket was $1,900 in crisp $100 bills and a typewritten note signed “Wm. L. Toomey,” asking that the money pay for his funeral and cremation. The coroner ruled he had died of cyanide poisoning.
“William Toomey” turned out not to exist. For the next 44 years, the man in the pew would be known only as the Unknown Wanderer.
On Wednesday, the Ada County Sheriff’s Office finally gave him a name. And the story that came with it has reopened one of the most notorious unsolved crimes in American history.
The Man in the Pew
The details investigators preserved from that December day read like a character sketch.
He wore a green long-sleeved shirt, blue jeans and cowboy boots, with a bolo tie made of turquoise and silver and a leather belt with a distinctive buckle. On his wrist was a Seiko watch. He had an ink marker and a lighter. His sandy hair had been dyed. His fingernails were finely filed, his skin was unseasonably tan for an Idaho December, and his pants were either brand new or freshly pressed.
And he had keys. Two key rings, holding nearly 30 keys between them.
The case was featured on Unsolved Mysteries in 1990. Tips came and went. Nothing stuck. The man was buried without a name.
A Parishioner, a Cup of Coffee, and a Key
The case might still be cold if not for a conversation in a parking lot.
In 2019, Ada County Sheriff’s Detective Tim Cooper was sitting in his car, drinking what he has described as cheap gas station coffee, when a member of the Sacred Heart parish approached and asked him about the old case. Cooper decided to take another look.
He started with the keys. One house key carried the markings of a hardware store in Jacksonville, Florida. It also bore an etching that pointed to a specific street: Mills Court.
Cooper pulled property records for the homes on that street. They led him to a man named Betkouski, who turned out to be the brother of the Unknown Wanderer. The empty wallet found on the body had preserved DNA. Investigators compared it to the brother’s DNA and got a familial match.
The man in the pew was Dr. Mathew Francis Betkouski.
It is a reminder that in cold cases, the answer is often sitting in the evidence box the whole time. It just takes someone willing to look at it with fresh eyes. We have seen that pattern before, in cases like Ellen Greenberg’s death in Philadelphia, where families and investigators kept pushing long after officials wanted the file closed.
Who Was Mathew Betkouski?
On paper, he looked like a success story.
Betkouski came from a prominent Los Angeles family. His grandfather had served as president of the Los Angeles City Council. He graduated from Loyola University in Los Angeles, earned a Ph.D. in chemistry, and worked as an organic chemist. According to The Spokesman-Review, he eventually worked for Lockheed on NASA-related projects at the White Sands Test Facility in New Mexico.
The record investigators pieced together shows a much darker picture underneath.
Betkouski had a documented fascination with chemistry and explosives going back to his youth. He struggled with mental illness, and a traumatic brain injury from a 1974 fall off a fence made it worse. He received inpatient and outpatient psychiatric treatment, including at UCLA’s Resnick Neuropsychiatric Hospital. Records from the late 1970s noted possible schizophrenia, depression and violent thoughts.
In 1975, he went to work for a flavors and fragrances company in Jacksonville. Coworkers later reported that he talked about committing the perfect crime using poisons. He was fired from jobs in Jacksonville and underwent psychiatric treatment in Florida in 1978 and 1979.
Late in 1979, Lockheed hired him at White Sands. There, according to CBS Chicago, colleagues recalled him discussing how poison could be introduced into medication capsules.
In March 1982, Lockheed fired him after a disturbance at a pharmacy near Las Cruces, New Mexico, where he tried to obtain pills or capsules he said were “for an experiment.” Police escorted him home.
Six months later, seven people in the Chicago area were dead.
The Tylenol Murders: A Crime That Changed America
For anyone too young to remember, it is hard to overstate how much fear the Tylenol murders caused.
Beginning on September 29, 1982, seven people in and around Chicago died after taking Extra-Strength Tylenol capsules that had been laced with potassium cyanide. Someone had taken bottles off store shelves, poisoned the capsules and put them back.
The victims were ordinary people doing ordinary things:
- Mary Kellerman, 12, of Elk Grove Village, who took a capsule for a cold.
- Adam Janus, 27, a postal worker from Arlington Heights.
- Stanley Janus and Theresa Janus, Adam’s brother and sister-in-law, who took capsules from the same bottle while grieving his death.
- Mary Reiner, 27, of Winfield, a new mother.
- Mary McFarland, 31, of Lombard.
- Paula Jean Prince, 35, a flight attendant from Chicago’s Old Town neighborhood.
Johnson & Johnson pulled some 31 million bottles off shelves nationwide. The crime led directly to the tamper-evident seals, foil liners and caplets that every American now takes for granted. Every time you peel the foil off a new bottle of pills, you are living with the legacy of that week in 1982.
For four decades, the closest thing to a suspect was James Lewis, who sent Johnson & Johnson a letter demanding $1 million to stop the killings. He was convicted of extortion but never charged with murder, and he always denied being the killer. Lewis died in July 2023 in Cambridge, Massachusetts.
What Links Betkouski to Chicago
At Wednesday’s press conference, Detective Cooper laid out what investigators found. It is, by any measure, a striking list.
- A hand-drawn map of Chicago dating to the 1970s, found at his brother’s home in Los Angeles.
- Photographs of Betkouski in the Chicago area, dated December 1981, less than a year before the poisonings.
- Personal writings expressing interest in going to Chicago, including a mention of “lots of things to do there.”
- A bottle of sodium cyanide with a handwritten label, found with his brother’s belongings. Residue linked to peach pits and apricot seeds suggested the cyanide was homemade.
- Frequent calls to chemical supply and pharmaceutical companies in the weeks before the poisonings.
- A documented history of talking about poisoning medication capsules and about the perfect crime.
Then there is what he did after. Following the Tylenol deaths, Betkouski sold his car and possessions from his home in Las Cruces and disappeared. He eventually took a train to Boise, where he arrived looking well-dressed and well-off, and where, on December 4, he took his own life with cyanide inside a church.
The Sheriff’s Office is asking anyone with information about Betkouski’s movements or communications between October 15 and December 4, 1982 to contact the Ada County Sheriff’s Office. Investigators say he lived at various times in California, Texas, New Mexico, Ohio and Florida.
What Does Not Add Up
This is where responsible reporting matters, and where a lot of headlines this week have gotten ahead of the facts.
The Ada County Sheriff’s Office has been careful and consistent: it is not naming Betkouski as a suspect in the Tylenol murders.
“It’s not our job to name him as a suspect,” Sheriff Matt Clifford said. “It’s not an Idaho case. The Tylenol case remains with Chicago, so we’ve sent everything to them.” He added that if Chicago investigators use the information to rule Betkouski out, “we’re all OK with that too.”
There are real gaps in the case:
- No one can place him in Chicago during the final week of September 1982, when the poisonings happened. The photos are from nine months earlier.
- The chemistry does not match. “This was sodium cyanide,” Cooper said. “This was not potassium cyanide, as was used in the Chicago-area deaths of 1982.”
- The FBI is skeptical. The bureau’s Chicago office noted that there have been repeated claims over the past 44 years about links to the Tylenol murders, and that they have remained unsubstantiated.
Former U.S. Attorney Jeremy Margolis, who worked on the original investigation, put the chemistry problem bluntly: “It’s cyanide. But it’s not what we have here.”
The Chicago Police Department confirmed only that its detectives have been in contact with Ada County to determine whether there is a connection to the case, which remains an open cold case.
The Psychiatrist Who Says It Is Him
Not everyone is holding back.
Dr. Park Dietz is one of the best-known forensic psychiatrists in the country. He testified in the trials of John Hinckley Jr. and Jeffrey Dahmer. He spoke at Wednesday’s press conference and afterward told reporters he believes Betkouski was the Tylenol killer.
“I believe that the unknown wanderer is exactly the kind of person who would have committed the Tylenol murders,” Dietz told Idaho News 6. He said he had presented Betkouski’s history to groups of forensic psychiatrists, psychologists and criminal profilers without revealing who he was, and that he was convinced enough to “put it to bed” for himself. He called the information developed about Betkouski “extraordinary.”
That is a serious opinion from a serious expert. It is also, by his own framing, an opinion. A profile is not proof, and the gap between “exactly the kind of person” and “the person who did it” is exactly where the Chicago investigators now have to do their work.
What Happens Next
The ball is in Chicago’s court. Investigators there now have to decide whether the Boise evidence warrants naming Betkouski as a suspect, or whether they can rule him out.
Some families of the victims have spent decades asking for more transparency. After the Boise announcement, the daughter of one Tylenol victim publicly called for the release of case records. For them, this is not a true crime puzzle. It is the loss of a mother, a daughter, a brother, and the question of who did it has hung over their families for 44 years.
The story is not going away. A new Unsolved Mysteries documentary, Unmasking the Tylenol Killer, is set to air on Roku on October 9 and will feature the Betkouski findings.
Whatever Chicago decides, one mystery is solved. The man who died in a Boise church pew in 1982 has a name again. His family knows what happened to him. And a detective who started asking questions over a cup of gas station coffee has put one of America’s coldest cases back on the table.
If you have information about Mathew Betkouski’s whereabouts between October 15 and December 4, 1982, contact the Ada County Sheriff’s Office.
Frequently Asked Questions
Who was the Unknown Wanderer?
The Unknown Wanderer was a man found dead of cyanide poisoning inside Sacred Heart Catholic Church in Boise, Idaho, on December 4, 1982. In September 2026, the Ada County Sheriff’s Office identified him as Dr. Mathew Francis Betkouski, an organic chemist from Los Angeles.
How was the Unknown Wanderer identified?
A detective traced a house key found on the body to a Jacksonville, Florida hardware store and a street called Mills Court. Property records led to Betkouski’s brother, and DNA from the man’s wallet produced a familial match.
Is Mathew Betkouski a suspect in the Tylenol murders?
No. The Ada County Sheriff’s Office has not named him as a suspect and has turned its evidence over to Chicago-area investigators. Forensic psychiatrist Dr. Park Dietz has said he believes Betkouski was responsible, but police cannot place him in Chicago during the poisonings, and his cyanide was a different compound.
What were the 1982 Tylenol murders?
In late September 1982, seven people in the Chicago area died after taking Extra-Strength Tylenol capsules laced with potassium cyanide. The case was never solved and led to tamper-evident packaging for over-the-counter medicines.
Who was James Lewis?
James Lewis was long considered the prime suspect in the Tylenol murders. He was convicted of attempting to extort $1 million from Johnson & Johnson but was never charged with the killings. He died in 2023.
Rocci J. Stucci is the founder and CEO of Stucci Media and host of The Rocci Stucci Show.
