John Green, 49, was jailed for life a year ago and with a recommendation that he serve at least 14 years before parole is considered.

Green was found by prison officers yesterday shortly before 9am but despite CPR being attempted and paramedics called in, he was later pronounced dead.

At his Old Bailey trial the court had been told that Green’s housemate Paul Duffy had been in a relationship with Nadia Boukhari, who also shared the same housein Stoke Newington, Londo.

Boukhari had hit Duffy over the head with a hammer and then Green had stabbed him in the chest. Boukhari, pregnant at the time but who later had a miscarriage, was jailed for seven years for manslaughter.

The court heard the Duffy was killed during a drunken argument over a cigarette.

Relatively few suicides now happen inside Whitemoor – which houses around 500 prisoners- following reforms brought in some years ago. In 2008 an inquiry was launched following five suicides in a year.