Danielle Mullenix
UPDATE:
BOISE, Idaho (KIFI) — Betkouski was discovered beneath a pew at Sacred Heart Catholic Church on Dec. 4, 1982, having ingested cyanide following a confessional service. He carried $1,900 in cash and left a typewritten suicide note instructing that the money cover his funeral expenses, signed only with the alias “William L. Toomey.” Without identification, his identity remained a mystery to authorities for decades.
The breakthrough came after Detective Tim Cooper with the Ada County Sheriff’s Office reopened the cold case in 2019. Local experts examined key evidence and deciphered an engraving on one of 30 keys recovered from the body, tracing it to “Mills Court” in Jacksonville, Florida.
“Working with investigators and records personnel in Jacksonville, our office was able to acquire property deeds dating back to the late ’70s and early ’80s from Mills Court,” Cooper said. “Our office attempted to locate everyone listed on those past deeds.”
That trail led investigators to a family member who confirmed a brother had gone missing in 1982. Subsequent DNA testing between the surviving relative and evidence recovered from the original scene confirmed the victim was Betkouski.
Unmasking the “Unknown Wanderer” unlocked a far more chilling possibility: a possible connection to the 1982 Chicago Tylenol poisonings, which claimed seven lives just three months before Betkouski’s death.
Betkouski had a background in chemistry and maintained an interest in cyanide and explosives. Following a major head injury in 1974, those close to him reported that he became paranoid and strange. Personal items recovered during the investigation included a 1970s map of Chicago and a small bottle labeled cyanide.
Renowned forensic psychiatrist Dr. Park Dietz reviewed the cold case findings alongside investigators and noted the strong overlap.
“Detective Cooper and I co-presented to the largest group of experienced criminal profilers at the FBI Academy, where everyone agreed this was a viable suspect,” Dietz said. “They were as convinced as I that Detective Cooper may have unlocked the most important unsolved murder of my lifetime—the Chicago Tylenol murders.”
Ada County officials confirmed that evidence gathered during the investigation has been shared directly with the Chicago Police Department. Despite the compelling behavioral profile, law enforcement has cautioned that Betkouski has not been formally named a suspect in the Tylenol killings.
However, the case is slated to gain national attention in an upcoming episode of Unsolved Mysteries airing Oct. 9. Ada County Sheriff Matt Clifford said he hopes the national broadcast will generate new tips to bring final resolution to both cold cases.
Editor’s Note: This story was adapted from an original on-air broadcast report with the assistance of AI. All content is thoroughly reviewed and verified for accuracy by the Local News 8 editorial team.
ORIGINAL:
IDAHO FALLS, Idaho (KIFI) – For nearly 44 years, a man known only as the “Unknown Wanderer” has remained one of Idaho’s most enduring unidentified-person cases.
This morning, investigators say they may finally know who he was.
Sketch of William L. Toomey
The Ada County Sheriff’s Office is expected to reveal the man’s identity Wednesday morning, along with new information about a possible connection between the decades-old Boise cold case and the infamous 1982 Tylenol poisonings in Chicago.
The announcement is scheduled for 10 a.m. Wednesday, Sept. 23, with Ada County Cold Case Detective Tim Cooper and Sheriff Matt Clifford expected to speak alongside forensic psychiatrist Dr. Park Dietz and “Unsolved Mysteries” co-creator and executive producer Terry Dunn Meurer.
A decades-long mystery dating back to 1982
The case began the evening of Dec. 4, 1982, when an unidentified man was found dead beneath a pew at Sacred Heart Catholic Church in Boise. Church members had previously seen the man at the 4 pm confession service.
According to the Doe Network, the man was believed to be between 35 and 45 years old. Investigators determined he died by suicide after ingesting a cyanide pill.
A typewritten note found by his body instructed that the money he carried be used for his funeral and cremation, with anything remaining donated to the church.
Interior of the Sacred Heart Catholic Church today in Boise, Idaho
He also had $1,900 in cash beside him, including 19 $100 bills, but no identification.
Despite years of investigation, authorities have been unable to identify him.
While the suicide note was signed with the name “Wm. L. Toomey,” investigators later determined that it was an alias:
Suicide note found near the “Unknown Wanderer”
“In the event of my death, the enclosed currency should give more than adequate compensation for my funeral or disposal (preferred to be cremated) expenditures. What is leftover, please take this as a contribution to this church. God will see to your honesty in this.”
— Wm. L Toomey
Investigators followed leads across several states, including California, Arizona, New Mexico, Pennsylvania, New York, Oklahoma, Tennessee, and Illinois.
The case eventually became known as the “Unknown Wanderer.”
A string of clues
The man was described as well-groomed and physically fit. He wore western-style clothing and a belt buckle containing a Mexican 100-peso coin. Investigators traced his belt to a western shop in Phoenix, Arizona.
The “Unknown Wanderer”‘s belt buckle
The name “William L. Toomey” also led investigators to a Massachusetts company that manufactured clothing for priests and nuns. However, investigators could not establish a connection between the company and the unidentified man.
His fingerprints also did not match any available databases. It is also unknown if authorities were able to retrieve DNA from the original scene.
The mystery received national attention when the case was featured on “Unsolved Mysteries” in 1990.
A possible link to the Tylenol Poisonings of 1982
The latest development adds another layer to the mystery.
The Ada County Sheriff’s Office says its investigation may have uncovered a connection between the Unknown Wanderer and the 1982 Tylenol poisonings, in which seven people in the Chicago area died after taking cyanide-laced capsules three months prior.
Those deaths occurred in September and October 1982 — just months before the unidentified man died in Boise from cyanide poisoning.
New Packing of over-the-counter medications was the immediate result of these murders
PBS News
Authorities have not publicly explained what they believe the connection may be. They expect to reveal it during today’s press conference.
The Tylenol killings remain unsolved. The case prompted major changes to over-the-counter medication packaging, including the widespread use of tamper-evident packaging.
A possible destination for the “Unknown Wanderer”
The Unknown Wanderer was eventually buried in Eagle under the name “William Toomey,” the alias used on his suicide note.
Now, after more than four decades, investigators say that name may finally be replaced by the man’s true identity.
The Ada County Sheriff’s Office is expected to provide those answers during Wednesday morning’s news conference.
Local News 8 will continue to update this story as investigators release new information. To watch the press conference this morning, click here.
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