Police have released an image of a man who may be able to help them in relation to a Marshall hit and run on July 17.
They are searching for 23-year-old Jesse Reynolds who is described as 190cm tall, thin build, fair complexion and brown hair.
It is alleged a red Holden Commodore sedan collided with a silver Mazda hatch on Barwarre Road about 6.15pm.
The driver of the Mazda, a 42-year-old Armstrong Creek woman, was airlifted to hospital with life-threatening injuries.
Police allege the male driver of the Commodore dumped the vehicle and fled on foot.
The male and female passengers of the Commodore, a 34-year-old man and 21-year-old woman from Grovedale, both remained at the scene.
They were both taken to hospital with minor injuries.
Anyone with information is urged to contact crime Stoppers on 1800 333 000 or submit a report at crimestoppers.com.au