Police are appealing for witnesses to a serious assault in Hallam in the early hours of Wednesday 20 April.
Casey Crime Investigation Unit detectives have been told a 23-year-old Endeavour Hills man was walking eastbound on the Princes Highway in Hallam between 12am and 12.30am.
The man walked out into traffic with multiple cars swerving to avoid him, before he crossed onto the southern side of the road.
A vehicle pulled over to check on the man and observed an unknown man exit a white hatch-back with a small spoiler, between Tinks Road and Raven Crescent, and strike the victim with a large baton or potentially a baseball bat, police say.
The 23-year-old man was taken to hospital with serious injuries.
The offender got back into the hatchback which drove off in a westbound direction.
Investigations into the incident remain ongoing and police believe parties involved may have been known to each other.
Police are appealing for anyone who witnessed the incident, has dash-cam footage or any other information that could assist investigators with their enquiries to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at crimestoppersvic.com.au
