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John Duffy was a British serial killer who, in partnership with childhood friend David Mulcahy, murdered multiple women the 1980s.
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The police believed that the two men were probably responsible for more deaths and sexual attacks and reinvestigated the 1980 murder of Jenny Ronaldson, 19, who was sexually assaulted, strangled and thrown in the Thames.
Apart from the level of ferocity associated with this case, the Duffy/Mulcahy casebook is one of the most significant criminal cases for its first use in England of psychological offender profiling.
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Many of the most horrifying acts of violence are committed by serial killers. Always looking for next victim, these murderers kill again and again, never fully satisfied by their bloody deeds. Their twisted motivations—and even more twisted techniques—land the people in this group among the most frightening criminals in history.
Infamous Serial Killers 35 people in this group
Famous People Named John 212 people in this group
Famous People Born in 1959 67 people in this group