Police are investigating the circumstances surrounding a serious crash which occurred in Frankston last night.
Investigators have been told a man attempted to cross Cranbourne Road about 11.10pm.
He crossed into the path of a west bound Jeep and was struck by the vehicle.
The pedestrian, who is yet to be identified and believed to be in his 20s, was airlifted to hospital suffering life threatening injuries.
Anyone who witnessed the crash or who may know the identity of the pedestrian is urged to contact Crime Stoppers on 1800 333 000 or visit www.crimestoppersvic.com.au