A 31-year-old woman was killed when the car she in crashed into a tree near Narrogin last night.
The woman was a front passenger when the white Holden Commodore sedan, driven by a 30-year-old man, when it left the road and hit the tree in Minigin about 6.45pm.
The vehicle had been travelling westbound from Narrogin to Williams on Clayton Road, about 8km west of Narrogin.
The driver and passenger were trapped in the car and had to be extracted by Department of Fire and Emergency Services officers.
The woman died at the scene, the fourth Christmas period road death in WA this year.
The driver was critically injured and airlifted to Royal Perth Hospital by the RAC Rescue helicopter.
He remains in RPH in a critical condition but is understood to be improving.
Police are investigating whether speed was a factor in the crash.
Police ask anyone who saw the Holden Commodore before the crash or witnessed the crash to contact Crime Stoppers on 1800 333 000.