In 2000, Duffy appeared at in court as a witness against Mulcahy and gave detailed and graphic evidence over 14 days.
It was a grave mistake, costing the lives of several women. Mulcahy was also questioned but eventually released. However, the victim, still traumatized from the assault, failed to pick him out. The description of the attacker fit Duffy and the police pulled him in for questioning and placed him in an identity parade. In September 1985, a woman was attacked in Barnet. When Duffy was finally caught, Canter was proved correct on at least 12 of these traits. Canter drew up a list of 17 personality and characteristic traits, including environmental clues that the offender may display.
The railroad killer victims crack#
Professor David Canter from Surrey University was called in to aid the police investigation and it was his profiling system which helped crack the case. A new concept in crime investigations, called psychological offender profiling, was evolving at the time. Mulcahy, who was Duffy's accomplice in the rape attacks, was also questioned and eventually released. Unfortunately, Duffy was far down the list of suspects. He was interviewed and eventually added to the Hart computer system as one of many thousands of men being investigated. However, in August 1985, after a bout of domestic violence at his home, where he attacked his wife, Duffy was arrested. Duffy and Mulcahy were pulled in for interrogation, but were eventually released. Then, in July 1985, three women were raped on the same night, all in the Hendon and Hampstead area. The police had no evidence to link the crimes and were unsure as to whether they were committed by the same man, or two different individuals. Early in 1984 the attacks began again, this time in west London and north London. Police later found out that this coincided with Duffy's separation from his wife. In the fall of 1983 the attacks suddenly stopped. since the Yorkshire Ripper investigation a few years earlier.
It was the largest investigation to take place in the U.K. The police set up an urgent workshop to try to find the perpetrators, called Operation Hart. In all, 18 women were raped near various train stations, as well as in an area close to Duffy's Kilburn house. The assault gave the two men a taste for terrorizing women in similar scenarios and for the next 12 months women were assaulted across London and its suburbs. On July 1, 1982, Duffy and Mulcahy attacked and raped a woman close to Hampstead Station in London's Hampstead village. Despite Duffy's police record - he assaulted his wife and was found carrying a knife - he was still able to carry out a string of sexual assaults and commit two murders over a 15 month period. Over the next four years 18 more women would be attacked. Their brutal crimes began on July 1, 1982, when the pair attacked and violently raped a 23-year-old woman in north London.
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