Unknown Wanderer Named as Roku's Tylenol Doc Seeks New Tips
Investigators in Idaho have put a real name to “The Unknown Wanderer” just as a new Unsolved Mysteries documentary prepares to examine a possible link to the unsolved 1982 Tylenol murders in Chicago.
The Ada County Sheriff’s Office in Boise says the man who used the alias William M. Toomey and died by suicide in a local church in 1982 was Dr Mathew Francis Betkouski, an organic chemist, according to The Hollywood Reporter. His body was discovered in Sacred Heart Catholic Church in Boise. His cause of death was determined to be cyanide ingestion.
That finding has placed Betkouski beside one of the most notorious unsolved cases in the United States. In the Chicago area in 1982, at least seven people died after taking extra-strength Tylenol capsules that had been tampered with. The killer had opened pain-medicine bottles in shops, replaced the powder inside the capsules with cyanide and returned the bottles to shelves. The attacks took place before tamper-proof safety seals became standard on medicines.
Ada County officials held a joint press conference with the Unsolved Mysteries team to discuss Betkouski’s potential ties to those deaths. Officials were careful about the limits of what they know. They said they are not naming Betkouski as a suspect in the Tylenol murders. They also said they cannot say whether he was in Chicago during the final week of September 1982, when the poisonings happened.
The office said it has shared all of its findings with Chicago police, who hold the Tylenol case. Sheriff Matt Clifford said the goal of working with Unsolved Mysteries was to seek more tips and evidence. The appeal is aimed at anyone who knew Betkouski or remembers his movements in his final years.
Detectives outlined parts of his life that led them to take a closer look. Detective Tim Cooper said Betkouski sustained a traumatic brain injury in 1974. He began work in 1975 for a flavours and fragrances company in the Jacksonville area. Coworkers later reported that he had talked about the perfect crime and about the use of cyanide.
That employment ended in 1982. Betkouski was fired after an incident at a local pharmacy, where he attempted to obtain pills or capsules for an experiment. Investigators have not said that this explains his death or connects him to Chicago. They have presented it as part of the timeline they want the public to help complete.
The television project built around that timeline is Unsolved Mysteries: Unmasking the Tylenol Killer. It premieres on the Roku Channel, a streaming service that is free to watch with advertising, on 9 October 2026. The series revisits cold cases on screen and asks viewers for information, a format that has long relied on public tips to move inquiries forward.
For now, two inquiries run in parallel. Chicago police continue to hold responsibility for solving the Tylenol poisonings. Ada County investigators want to close the gaps around Betkouski’s later life, from Florida to Idaho. Both are waiting to see whether putting his name and photograph before a wide streaming audience produces new and checkable evidence.
