Police are investigating a suspected hit-and-run after a man was found dead in Golden Bay this morning.
Drivers found the man in the northbound lanes of Mandurah Road, near Dampier Drive just before 3am.
Police quickly closed Mandurah Road northbound at the Dampier Driver intersection.
Mandurah Road will remain closed for most of the day in both directions between Anstey and Paganoni Roads.
Drivers heading along the road are being diverted from Anstey Road in Secret Harbour, through Golden Bay, and onto Crystaluna Drive.
Access to Mandurah Road via Dampier Drive is now closed.
Major Crash investigators urge anyone with information to contact Crime Stoppers on 1800 333 000.