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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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Play NowJohn Duffy. (2013). The Biography Channel website. Retrieved 05:17, Jun 20, 2013, from http://www.biography.com/people/john-duffy-17169740.
John Duffy. [Internet]. 2013. The Biography Channel website. Available from: http://www.biography.com/people/john-duffy-17169740 [Accessed 20 Jun 2013].
"John Duffy." 2013. The Biography Channel website. Jun 20 2013, 05:17 http://www.biography.com/people/john-duffy-17169740.
"John Duffy," The Biography Channel website, 2013, http://www.biography.com/people/john-duffy-17169740 [accessed Jun 20, 2013].
"John Duffy," The Biography Channel website, http://www.biography.com/people/john-duffy-17169740 (accessed Jun 20, 2013).
John Duffy [Internet]. The Biography Channel website; 2013 [cited 2013 Jun 20] Available from: http://www.biography.com/people/john-duffy-17169740.
John Duffy, http://www.biography.com/people/john-duffy-17169740 (last visited Jun 20, 2013).
John Duffy. The Biography Channel website. 2013. Available at: http://www.biography.com/people/john-duffy-17169740. Accessed Jun 20, 2013.
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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