A 90-year-old man has died in hospital from injuries he received in a serious crash which occurred in Ravenswood on Friday about 5.25pm.
A police spokesperson said the man died on Saturday afternoon.
The crash happened when a 1993 green Ford Festiva hatch was travelling west on Pinjarra Road and collided with the rear of a blue 2008 Mazda 2B hatchback just west of the Kwinana Freeway.
The elderly man was driving one of the vehicles and suffered life threatening injuries in the crash.
He was rushed by ambulance to Peel Health Campus for medical treatment, before being transferred to Royal Perth Hospital.
Major Crash investigators are seeking witnesses who may have seen the vehicles driving in the Ravenswood area prior to or at the time of the crash, to call Crimestoppers on 1800 333 000.