A notorious inmate known as the 'Saw Killer' is to stay behind bars until at least 2065 after he stabbed two prison guards in the jail dubbed 'Monster Mansion'.
Sadistic Matthew Tinling, 38, attacked the officers in HMP Wakefield, West Yorkshire, after becoming enraged that his exercise regime had been altered.
Tinling, who was already serving three life sentences for murder, attempted murder and wounding, was today handed a further life sentence after pleading guilty causing grievous bodily harm with intent on the prison guards on January 23 last year.
A judge told him he was 'a potentially lethal and real danger' to both prison staff and fellow inmates.
One of the officers stabbed 'feared for his life', Leeds Crown Court heard.
