Idaho’s ‘Unknown Wanderer’ Identified 43 Years Later; Ties to Chicago Tylenol Murders Explored

Police in Boise, Idaho, announced Wednesday that they have identified the “Unknown Wanderer,” a man whose unidentified body was discovered in a church in 1982. Investigators revealed a potential, though unproven, connection to the infamous Chicago Tylenol murders, a case that remains unsolved four decades later.

Ada County Sheriff’s Office detectives stated they cannot confirm the man was in the Chicago area during the final week of September 1982, when the poisonings occurred, and have not named him as a suspect in those crimes. However, they disclosed a trail of circumstantial evidence, including a hand-drawn map of Chicago, photographs of the man in the Chicago vicinity, and a bottle of homemade cyanide. This evidence has been shared with the Chicago Police Department.

The mystery began on December 4, 1982, when the man was found deceased inside Sacred Heart Catholic Church in Boise. He possessed no identification, though sweat stains on his empty wallet indicated where cards had previously been stored. His belongings included an ink marker, a lighter, a Seiko wristwatch, a leather belt with a distinctive buckle, a turquoise and silver bolo tie, two keyrings holding nearly 30 keys, and an envelope containing $1,900 in $100 bills. A typed note signed “William L. Toomey” was found on his person, but police determined the name was fabricated.

The man’s appearance suggested he was not homeless; his fingernails were neatly filed, his hair dyed and styled, and his pants were either new or freshly pressed. He had a deep, even tan indicative of living in a warm climate. Despite decades of investigation, his fingerprints did not match any records in Idaho or with the FBI, and a 1990 episode of “Unsolved Mysteries” generated thousands of tips without yielding concrete leads.

According to Ada County Sheriff Matt Clifford, Detective Frank Richardson worked the case for years before retiring. In 2019, Detective Tim Cooper, who has 24 years of experience, reopened the investigation and ultimately solved it.

During a news conference, Cooper explained that the breakthrough came from examining one of the nearly 30 keys the man carried. The key bore a marking indicating it originated from a hardware store in Jacksonville, Florida, along with an etching previously misidentified. Further research into the marking and etching led Cooper to Mills Court in Jacksonville. Reviewing property deeds from the late 1970s and 1980s, Cooper discovered a property owned by a man reported dead in 1989. After locating the man’s surviving brother in Los Angeles, DNA testing confirmed a match between the brother and DNA recovered from the wanderer’s wallet, proving they shared the same father.

The Unknown Wanderer has been identified as Dr. Mathew Francis Betkouski. Investigators described him as coming from a prominent Los Angeles family; his grandfather served as president of the Los Angeles City Council and briefly as interim mayor, while his father was a senior official with the Los Angeles Department of Water and Power.

Betkouski had a long-documented fascination with chemistry and explosives dating back to his youth. Cooper noted that Betkouski struggled with mental illness throughout his life, and a traumatic brain injury in 1974 exacerbated his condition. In 1975, Betkouski moved to Jacksonville to work for a flavors and fragrances company, where coworkers reported his strange behavior, including talks about committing the “perfect crime” with poisons and discussions of suicide.

His paranoia intensified during this period, and colleagues sometimes observed him talking to himself. Betkouski underwent inpatient and outpatient mental health treatment in Los Angeles for two months in 1978. Upon returning to Florida, he was terminated from his jobs. After his mother’s death in 1979, he spent over a month in psychiatric treatment at a Florida state hospital.

Personal writings from the late 1970s and early 1980s revealed Betkouski’s preoccupation with managing schizophrenia and depression, as well as his interest in achieving euphoria through “imaginary thoughts of violence.” In late 1979, he was hired by Lockheed to work at its test facility in White Sands, New Mexico. Former colleagues recalled him discussing how poison could be introduced into over-the-counter medication capsules. Lockheed fired Betkouski in March 1982 following an altercation at a local pharmacy where he allegedly attempted to obtain pills “for an experiment.” Police who responded discovered he was conducting experiments in his home garden.

In 2021, after Betkouski’s brother passed away, relatives permitted Idaho police to search Los Angeles for personal effects. Investigators found photos, letters, a hand-drawn map of Chicago believed to be from the 1970s, and a small bottle labeled with handwritten text containing sodium cyanide. While the Chicago Tylenol murders involved potassium cyanide, testing revealed the bottle contained peach and apricot pits, suggesting Betkouski made the cyanide himself.

Writings indicated Betkouski had an interest in visiting Chicago. Photos found among his belongings showed him in the Chicago area, initially thought to be from late 1982 but later dated to December 1981. Police remain uncertain whether he returned to Chicago after that time and cannot place him there during the week of the poisonings.

Boise police are not naming Betkouski a suspect in the Chicago Tylenol murders due to the lack of definitive proof he was in the area at the time. However, they noted he was found dead just three months after the Tylenol killings, took steps to conceal his identity, and the coroner ruled his cause of death as cyanide poisoning.

“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.”

The Chicago Police Department reviewed the findings and stated they are in contact with the Ada County Sheriff’s Office regarding the open cold case. The Arlington Heights Police Department also reviewed the information and pledged to continue working with other agencies. The FBI Chicago office released a statement noting that numerous claims linking individuals to the Tylenol murders over the past 44 years have remained unsubstantiated, and they remain the lead agency on the investigation.

The 1982 Tylenol poisonings resulted in the deaths of seven people in the Chicago area, including 12-year-old Mary Kellerman, postal worker Adam Janus, and his brother Stanley and sister-in-law Theresa. Johnson & Johnson initiated a nationwide recall, and a 15-agency task force was formed to apprehend the killer.

James Lewis was long considered the prime suspect after Johnson & Johnson received an extortion letter demanding $1 million to stop the killings. Lewis was traced to the letter and served more than a decade in prison for attempted extortion but was never charged with the murders. He died in 2023.