A fact from John Duffy and David Mulcahy appeared on Wikipedia's Main Page in the Did you know column on 19 January 2006. The text of the entry was as follows:
Did you know... that psychological offender profiling was used by British police for the first time in capturing John Duffy, the so-called Railway Killer?
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Does anyone know the birth dates of either of these men? I can't seem to find them anywhere. Codu(t)⁄(c) • 17:36, 20 June 2007 (UTC)[reply]
FreeBMD has only one birth entry for a Duffy, John F born in 1958 here, mother's name Westwick, registered December 1958, in Tynemouth. There are five birth entries for a Mulcahy, David, but with no other details it is not possible to determine which might be the correct one. Martinevans123 (talk) 21:51, 19 August 2021 (UTC)[reply]