Major Collision Investigation Unit detectives are appealing for witnesses and dash cam footage following a fatal crash in Clayton South on Friday, Aug. 14.

It is understood a 2004 red Toyota Corolla was travelling north along Clayton Rd when the driver veered and crashed into a power pole about 2pm on August 14.

The front passenger, an 85-year-old Clarinda woman, was taken to hospital with serious injuries but sadly died on Thursday (Aug. 20).

The driver, a 55-year-old Clarinda woman, was transported to hospital for observation but has since been released.

Detectives are investigating the cause of the crash and urge anyone who witnessed it or with dash cam footage to come forward.

Anyone with information is urged to call Crime Stoppers on 1800 333 000 or submit a confidential report at www.crimestoppersvic.com.au