A serial killer, dubbed the "man in black," has died at high-security Broadmoor hospital, it has emerged.
Peter Moore, from Kinmel Bay, in Conwy, was called as dangerous a man as it was possible to find, when he was sentenced to life imprisonment in 1996.
Cinema owner Moore was convicted of killing four men in four months in 1995 for his sexual gratification.
He died on 30 July aged 70 but his death has only just been confirmed.
His death was confirmed by West London Mental Health Trust, which runs Broadmoor, home to some of the UK's most notorious criminals.
No statement has been released, and an inquest will be held later.
Moore, who was dubbed the "man in black" for his trademark black shirt and tie, was responsible for four murders in only four months:
Henry Roberts, 56, was stabbed to death at his home on Anglesey in September 1995.
Edward Carthy, 28, was stabbed and buried in a forest after meeting Moore in a gay bar.
Keith Randles, 49, a traffic safety manager, was similarly killed as he slept in his caravan at road works on the A5 in Anglesey in November 1995. Moore later told police there was "a certain enjoyment" for him in the killing.
Tony Davies, 40, his final victim was a married father of two who was stabbed at a beach near Abergele, Conwy, in December 1995.
Peter Moore ran a chain of small cinemas in north Wales
As well as the killings, Moore attacked more than 50 men across north Wales and Merseyside in what was described by the trial judge as "20 years of terror".
Moore had claimed during the trial that the murders were committed by a gay lover he nicknamed "Jason" after the character of a killer in the Friday the 13th films.
In 1996, Mr Justice Maurice told Mold Crown Court that Moore should never be set free.
Before being transferred to Broadmoor, he served time at high-security Wakefield prison in West Yorkshire with killer GP Harold Shipman, who hanged himself in 2004.
At the inquest into Shipman's death, Moore told West Yorkshire coroner David Hinchliff, sitting at Leeds Crown Court, that he spoke to the former GP every day in the prison's exercise yard.
In 2004, the Daily Post newspaper claimed it had refused to run an advertisement by Moore appealing for witnesses to help him overturn his convictions.
Two years ago, appeal court judges ruled that Moore, who was born in St Helen's on Merseyside, would spend the rest of his life behind bars.
Sir Anthony May, announcing the ruling said Moore had gained sexual gratification from the infliction of terror, humiliation and pain.
"He carried out a programme of savage murders of strangers who had done him no harm whatsoever." said Sir Anthony.
"This was a chilling orgy of murder, and it would be difficult to find a more dangerous man."