Melbourne North police are appealing for assistance from the public after a man performed a lewd act in Carlton in May.
Investigators have been told a 28-year-old woman was sitting on a bench and having a cigarette on Bouverie Street, Carlton about 1.15am on 10 May.
A man approached the victim and tapped her on the shoulder to get her attention while committing a lewd act.
The victim got up and walked away.
The offender is perceived to be 175centimeters tall, 20-30 yeas-old with short dark hair and a medium build.
Investigators have released an image of a man they believe can assist with their enquiries.
Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report at www.crimestoppersvic.com.au