In 1982, someone went around to stores in the Chicago area and replaced the powder in Tylenol with cyanide. Seven people died. They never found who did it. Incidentally, this is the reason why we now have tamper-resistant packaging on medications.
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100 Murder Cases
Mystery / Thriller100 murder cases that are either solved or not solved
Tylenol Murders
In 1982, someone went around to stores in the Chicago area and replaced the powder in Tylenol with cyanide. Seven people died. They never found who did it. Incidentally, this is the reason why we now have tamper-resistant packaging on medications.