The Chicago Tylenol Murders happened in 1982. Someone put poison in bottles of Tylenol, which is a medicine that helps people feel better when they are not feeling well. Seven people died from taking the poisoned Tylenol, which made lots of people very scared. The police tried to find the person who poisoned the Tylenol, but never found the person responsible for it. Even today, nobody knows who was behind the poisonings.