A mysterious man who died of cyanide poisoning inside an Idaho church more than four decades ago has finally been identified, and investigators say his past raises questions about a possible connection to the still-unsolved 1982 Chicago Tylenol murders.The man known for decades as the "Unknown Wanderer" was Dr.Mathew Francis Betkouski, an organic chemist with a history of discussing cyanide and poison, the Ada County Sheriff's Office in Boise announced Wednesday.Investigators said they couldn't place Betkouski in Chicago during the final week of September 1982, when seven people died after taking Tylenol capsules laced with cyanide, and they are not naming him as a suspect.TYLENOL MURDERS SUSPECT GAVE EERIE FINAL INTERVIEW BEFORE DEATHForensic psychiatrist Dr.
Park Dietz speaks during a news conference Wednesday at the Ada County Sheriff's Office in Boise, Idaho, about the "Unknown Wanderer" — now identified as Dr.Mathew Francis Betkouski, pictured next to Dietz on a video screen — and his possible connection to the 1982 Tylenol murders.
(Ada County Sheriff's Office / Facebook)Forensic psychiatrist Dr.Park Dietz, who consulted during the original Tylenol investigation and reviewed the evidence gathered on Betkouski, offered a stronger assessment."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 groups of forensic psychiatrists, psychologists and criminal profilers who were anonymously presented with information about Betkouski overwhelmingly considered him a viable suspect.Betkouski died on Dec.
4, 1982, after walking into Sacred Heart Catholic Church in Boise.Authorities determined he died from cyanide poisoning, but he carried no identification and his fingerprints produced no match.REMAINS FOUND IN UTAH DESERT 28 YEARS AGO WITH HELP OF A PSYCHIC FINALLY IDENTIFIED THROUGH DNA GENEALOGYInvestigators in Idaho subsequently uncovered several details that drew their attentio...