The man convicted of the "limbs-in-the-loch" murder of a teenager wants to take his fight for freedom to Britain's Supreme Court.
William Beggs, 46, was found guilty of killing and dismembering Barry Wallace in Kilmarnock, Ayrshire, in 1999.
The 18-year-old's remains were found in Loch Lomond and on a beach near Troon.
Beggs' lawyer asked appeal judges in Edinburgh to postpone his hearing while he attempts to appeal his minimum 20-year sentence at the Supreme Court.
The killer began a full appeal against his conviction at the Court of Criminal Appeal in Edinburgh last September.
He argued that the trial which saw him convicted was unfair and that he was a victim of a miscarriage of justice.
After his appeal was turned down in March this year, Beggs sought leave to appeal to the Supreme Court but that application was refused by the Court of Criminal Appeal in May.
He returned to the same court on Wednesday to challenge a ruling that he must serve at least 20 years of his life sentence before he can ask for parole.
Defence advocate Chris Shead asked appeal judges to postpone the hearing while Beggs tries again to take his case to the Supreme Court.
His defence team are hoping that even if he fails to persuade the Supreme Court to overturn his conviction completely, some of the detailed allegations against him might be dropped.
Mr Shead said that would have a bearing on the question of sentence.