The partner of a man who died during a horrific head on collision on Brookton Highway in Lesley on January 29 has also died.
A late model maroon coloured Land Rover four wheel drive collided with a late model Nissan Navara 4WD about two kilometres east of Kinsella Road, Lesley at about 12.11pm.
Yesterday a 67 year old woman succumbed to her injuries and died in Royal Perth Hospital.
The husband of the woman, a 68 year old male passenger in the Navara, died at the scene.
Another 67 year old woman in the Navara also received life threatening injuries.
The 48 year old driver of the Land Rover sustained life threatening injuries.
All injured were airlifted to Royal Perth Hospital and the other victims are still in a critical condition.
Major crash investigators want to speak to anyone who may have seen either vehicle driving in the Lesley area prior to the crash.
Call Crime Stoppers on 1800 333 000.