Bayside Sexual Offences and Child Abuse Investigation Unit detectives are appealing for public assistance following a sexual assault in St Kilda in February.
Investigators have been told the victim was at a licensed premises on The Esplanade about 2.50am on 18 February.
A man approached the victim and sexually assaulted her before walking away.
The offender is perceived to be of Indian appearance, 30-years-old with black facial hair and black mid-length hair which was tied into a ponytail.
He was wearing a white button-up shirt, white pants, and white sneakers with black markings.
Investigators have released footage of a man they believe may be able to assist with their investigation.
Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report at www.crimestoppersvic.com.au