One of the men who murdered Arbroath oil worker Steven Donaldson has been found dead in his Perth Prison cell.
Steven Dickie, 24, was serving a minimum 23-year jail term for killing Mr Donaldson in June 2018.
The Scottish Prison Service said a fatal accident inquiry would be held.
Co-accused Callum Davidson, who was also found guilty of murder, and Tasmin Glass who was convicted of culpable homicide, had appeals against their sentences refused on Friday.
Dickie and Davidson attacked Mr Donaldson after he had arranged to meet ex-girlfriend Glass on Kirrie Hill, Angus.
The trial was told that Mr Donaldson died after his spinal cord was repeatedly cut by a weapon, like a sword, machete, cleaver or axe.
Trial judge Lord Pentland said Dickie and Davidson had used "extreme violence", which had been "sustained and prolonged."