Two months after Colin Farrell and Muireann McDonnell began dating, Muireann’s ex, John Knight, was so distraught he killed himself.

Following their split at Christmas, John briefly hooked up with another girl.

Farrell met Muireann when he went to a party at a bar in Dalkey, near Dublin �" opposite the gourmet food store where she worked.

A pal of John’s said: “They must have hit it off immediately. They began to go out. John was devastated.”
The former altar boy was ...