Police were last night searching for a 26-year-old man who fled a fatal car crash on the Mitchell Freeway.
A police spokesman said a 28-year-old woman died at the scene when a vehicle travelling south, which is believed to be stolen, spun out and rolled down a small embankment near the Karrinyup Road exit at about 6.30pm.
He said witnesses reported the silver Holden Viva rolled three or four times before coming to rest on the roof and the vehicle was seen to rock from side to as if someone was trying to grab the steering wheel.
A man reportedly got out of the silver wagon and ran away immediately following the crash.
The woman who died is believed to have been the driver of the car.
A St John Ambulance spokeswoman said a 26-year-old woman, who was a passenger in the car, was injured and was taken to Royal Perth Hospital with minor injuries.
Major crash officers were last night probing the incident and the police helicopter was mobilised to search for the missing man, who was one of the two passengers in the car.
The vehicle is believed to have been used in crimes earlier in the day.
Traffic slowed to a crawl following the crash with two lanes of the freeway and the Karrinyup Road Exit closed to all motorists.
A Department of Fire and Emergency Services spokesman said fire and rescue crews from Osborne Park and Daglish attended the scene.
Those with information on the crash are asked to contact Crime Stoppers on 1800 333 000.