Justice Sandil Kissoon imposed the sentence on Arthur at the Demerara High Court.
Last month, Arthur was arraigned for the capital offence of murder but opted to plead guilty to the lesser count of manslaughter.
The Court heard that on May 10, 2018, at Ameliaâs Ward, Linden, he killed Claude DeJonge, who was at the time asleep with 35-year-old Tanya Samuels.
Arthur gained entry through an open window and confronted him in the bed.
The two ended up in a fight, during which, Arthur dealt DeJonge three stab wounds with a knife while allegedly shouting: âI gone kill you, I want you soul, me gone murder youâ.