A 24-year-old Attadale man died yesterday when his car hit a tree east of Harvey.
South West Traffic officers are investigating the fatal crash.
About 6.25pm, a white Ford Ranger ute was being driven by the man in a north-easterly direction on the Harvey-Quindanning Road.
About 18km east of Harvey, police believe the driver lost control of the vehicle on the unsealed road and collided with a tree on the left side of the road.
Investigators would like anyone who saw the crash or the vehicle prior to the crash to call Crime Stoppers on 1800 333 000 or make a report online at www.crimestopperswa.com.au.