Investigators have been told the 59-year-old Ararat man had been walking his dog along Barkly Street about 10.50pm on July 1.

He was discovered with serious head injuries by a female passer-by and was taken to hospital in a critical condition. He spent 28 days in intensive care.

Detectives were initially unable to determine the exact cause of the man’s injuries, however now believe he may have been struck to the back of the head.

It is believed a man and woman fled the scene following the incident.

Detectives are appealing for information to help identify those involved, and are also urging the person who contacted Triple Zero to come forward as they may hold vital information that could assist.

Police urged anyone with information to contact Crime Stoppers on 1800 333 000 or submit a report online at www.crimestoppersvic.com.au