Idaho cold case may link man to unsolved 1982 Tylenol poisonings

Authorities have posthumously identified Dr. Mathew Francis Betkouski as a potential suspect in the 1982 Chicago-area Tylenol murders, based on a reopened cold case investigation. Betkouski died by cyanide suicide in an Idaho church decades ago. The claim is based on investigative inference and remains unconfirmed, but if proven, it would resolve a landmark case that changed pharmaceutical safety standards.