The Wewak National Court handed down the court decision to French William, of Western Highlands, on Thursday 18th April.
First Constable William was arrested in 2014 for his alleged involvement in the murder of one Othoniel Kapris.
Investigations revealed that the male victim was beaten to death while being detained at the Maprik Police Station Cell block 1.
William had reportedly picked up Kapris and a group of others on the 14th August of 2014, when he responded to a commotion at the Top Hill area of Maprik Town.