![](../images/mulcahy_david/david-mulcahy2.jpg)
David Mulcahy
For 12 years the
police considered the "Railway Rapes" case closed, until
Duffy made a startling
confession that he had an accomplice,
his schoolfriend David Mulcahy.
![](../images/mulcahy_david/david-mulcahy4.jpg)
David Mulcahy
![](../images/mulcahy_david/david-mulcahy3.jpg)
Mulcahy photographed at a
police station in 1984.
![](../images/mulcahy_david/david-mulcahy.jpg)
Another mugshot of David Mulcahy
![](../images/mulcahy_david/police-search.jpg)
Police search
![](../images/mulcahy_david/police-search2.jpg)
Another police search
![](../images/mulcahy_david/evidence.jpg)
Police evidence
![](../images/mulcahy_david/evidence2.jpg)
Tourniquet made of Alison Day's blouse.
![](../images/mulcahy_david/john-duffy4.jpg)
Duffy was very
interested in martial arts. He trained with swords, knives,
a quarterstaff and a garotte, and was much taken with the
martial art of Zen Budo,
which he believed dictates: "Leave
no witnesses."
![](../images/mulcahy_david/john-duffy5.jpg)
John Duffy with his wife Margaret Byrne, at a family wedding.
In 1982 Duffy was told
that he had a low sperm count witch would prevent him from
having a child. He vented his boiling frustrations on his
wife Margaret. Duffy liked to tie his wife up before having
sexual intercourse. He told her that it was her - not his -
fault that she had not become pregnant. The couple split up
twice. On one of her visits to his flat to pick up her mail,
Duffy raped her.
![](../images/mulcahy_david/duffy1.jpg)
John Duffy "the man with the laser eyes".