Answer: Cyenide-filled Tylenol capsules

Most victims of what have become known as the Tylenol poisonings were in Chicago, in 1982, but one 23-year-old was in Yonkers when she died in 1986 after ingesting two Extra-Strength Tylenol capsules laced with cyanide. No one was ever charged or convicted of the bizarre and horrific drug tampering attacks, which killed seven in Chicago. The mass murder remains unsolved.