Yarra Crime Investigation Unit detectives have released CCTV footage as part of their investigation into an assault in Fitzroy earlier this year.
A 59-year-old Fitzroy North man was assaulted by an unknown male offender after a brief encounter outside a Brunswick street shop about 12.15am on 16 April.
The man sustained a fractured skull and was taken to hospital via ambulance.
Police have released CCTV footage and still images of a man they believe could assist with enquiries.
He is described as Caucasian with a distinctive blond haircut, shaved on the sides and long at the back.
Anyone who recognises the man, witnessed the incident or has any information that could assist police with their enquiries is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at www.crimestoppersvic.com.au