The world's worst serial killers
Pietro Pacciani - 16 murders
Where: Florence, Italy
When: 1968 to 1985
Pietro Pacciani, the "Monster of Florence", was convicted in 1994 of murdering eight couples in lovers' lanes near Florence. Pacciani was given 16 life sentences but died of a heart attack in February 1998, while awaiting a retrial.
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