Police were on scene at a property in Sunbury following a collision on 11 December.
It is understood there was a collision involving a vehicle and a man on Lancefield Road about 7pm.
The man was taken to a medical centre on Dornoch Drive, where he was airlifted with life-threatening injuries.
The driver of the vehicle stopped at the scene and is assisting police with their enquiries.
A woman who accompanied the man to the medical centre is also assisting police with their enquiries.
Anyone with information or footage is urged to contact Crime Stoppers on 1800 333 000 or visit www.crimestoppersvic.com.au
