Reza Barati, was 23 when he was beaten to death during rioting in the Manus Island Detention centre in February 2014.
Two men Joshua Kaluvia and Louie Efi were today found guilty of Barati's murder by PNG's national court and sentenced to 10 years' jail, with five years suspended.
With time already served, the pair will be released in a little over three years.
The court heard Kaluvia who worked with the Salvation army Barati with a piece of wood with a nail embedded in it in the head repeatedly.
Efi who is understood to have been employed has a guard with contractor G4S then dropped a large block on Mr Barati's the killing had not be charged and tried.