The Chicago Tylenol Murders were a series of poisoning deaths resulting from drug tampering in the Chicago metropolitan area in 1982. The victims had all taken Tylenol-branded acetaminophen capsules that had been laced with potassium cyanide.[1] A total of seven people died in the original poisonings, with several more deaths in subsequent copycat crimes.

Ref: 
Wikipedia
www.unsolvedcasebook.com
www.medium.com


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