Police are investigating a 40-year-old police officer's death inside the Happy Valley Police Station today.

The Senior Police Constable, attached to the Happy Valley Police Division Patrol Subunit, was found locked inside a changing room at about 3pm.

Police broke into the room and found he had a gunshot wound to his right temple, and was certified dead at thescene.

It is believed he committed suicide with his service revolver, and a post-mortem examination will be conducted.