A man who killed and beheaded a teenage boy, before dumping his dismembered body in a bin, has won the right to challenge his murder conviction.
The teenager went to Blackpool looking for work
Stuart Diamond's trial was told he killed 17-year-old Christopher Hartley after luring him back to his flat in Blackpool in December 1997.
He was jailed for life in 1999 and told he must serve 17 years.
But new evidence suggests he was suffering from an "abnormality of mind" at the time he killed Mr Hartley.
The Criminal Cases Review Commission, which investigates possible miscarriages of justice, said this might have substantially diminished his mental responsibility.
"The commission considers that there is a real possibility that the Court of Appeal would substitute a manslaughter conviction on the grounds of diminished responsibility," it said in a statement.
Christopher Hartley, a homeless heroin addict from Burnley, went to Blackpool intending to find work at the Pleasure Beach.
He was looking for accommodation in the early hours of 30 December 1997 when Diamond invited him to his flat.
Parts of the teenager's body were found behind the resort's New Central Hotel later that day but his head has never been recovered.
Diamond was extradited from his native Ireland in January 1998 to stand trial at Preston Crown Court.
The court heard that he had told psychiatrists he had fantasised about killing people, but no specific motive was found for the murder.