Major Collision Investigation Unit detectives are currently on the scene of a serious collision in Echuca.
Investigators have been told a pedestrian was on a shared walking track between McKenzie Street and Campapse Esplanade when he was struck by a motorcycle at about 12.15am this morning.
It is believed the motorcyclist was speeding when it struck the pedestrian.
The motorcyclist also fell to the ground and a nearby witnesses came to the aid of both men.
The motorcyclist got back on his bike and fled the scene toward Campaspe Esplanade.
The pedestrian sustained life threatening injuries and was airlifted to hospital in a critical condition.
The motorcyclist is described as Caucasian, approximately 183cm tall with a tanned complexion and a medium build.
Police are appealing for anyone who witnessed the incident or who have any information in relation to the collision to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at www.crimestoppersvic.com.au