Nunawading Highway Patrol officers are investigating following a fatal crash on Heidelberg-Warrandyte Road, Warrandyte on Sunday, 26 June.
Emergency services were called to reports a car had left the roadway, mounted an embankment and crashed into a tree on Heidelberg-Warrandyte Road on Sunday, 26 June about 3.20pm.
The driver and passenger were taken to hospital with serious injuries.
Sadly, the passenger, an 84-year-old Ashwood woman, died later in hospital.
The exact circumstances surrounding the collision are yet to be determined and investigations remain ongoing.
Anyone with information is urged to contact police.