A 17-year-old boy has died after he fell from the back of a ute at Gnangara last night.
The incident happened on Lakelands Drive, near Colonial Circle, about 9pm.
A police spokesman said paramedics administered CPR and the teenager was airlifted to Royal Perth Hospital in a critical condition by the RAC rescue helicopter.
"It is understood the boy fell from the tray of a Nissan utility," a police spokesman said.
He died in hospital overnight after suffering severe head injuries.
Major Crash officers are investigating.
The fatality is the third on WA roads over the Christmas period.
Anyone with information is asked to call Crime Stoppers on1800 333 000.