A young woman is dead and two more people critically injured after a fatal crash on Brand Highway, Muchea on Sunday afternoon.
About 2.40pm, a silver Holden Rodeo utility headed south collided with a gold Toyota sedan travelling north near Chandala Brook Bridge.
The Toyota's driver, a 25-year-old Thornlie woman, died at the scene.
Her passenger, a 20-year-old Thornlie woman and 40-year-old Bennett Springs man driving the Holden were both flown to Royal Perth Hospital from the scene with life-threatening injuries.
They remained there in critical condition on Monday morning.
Major Crash officers need to speak to anyone who may have seen the crash, or the vehicles prior to the crash. Information can be given to Crime Stoppers on 1800 333 000 or online www.crimestopperswa.com.au.