Police are seeking witnesses to a fatal crash which occurred at around 6am today.
An 18-year-old man from Australind was driving a Holden Commodore north along the South West Highway, Wokalup when his vehicle hit a tree.
He was the sole occupant of the car.
He was flown to Royal Perth Hospital by RAC helicopter but died a short time ago.
Police are appealing for the driver of a white utility, driving behind the man at the time of the crash, to come forward to assist with inquiries.
The witness is asked to contact Crime Stoppers on 1800 333 000.