Idaho law enforcement identified a man who poisoned himself in a Boise church 44 years ago as Mathew Francis Betkouski, a chemist with a documented interest in cyanide, and believe he may be connected to the 1982 Tylenol murders that killed seven people in the Chicago area. Betkouski had access to cyanide, attempted to obtain capsules in New Mexico in March 1982, and disappeared after the poisonings; investigators are seeking new leads rather than naming him as a suspect.