Detectives from the Port Phillip Criminal Investigation Unit have released CCTV footage of a woman in relation to a robbery in St Kilda last month.
Investigators have been told an unknown woman forced an 84-year-old man into a public toilet before stealing his cash and Medicare card about 3pm, 19 January.
Police have released CCTV of a woman inside a nearby licensed premises a short time after the incident.
Detectives believe this woman could assist with their investigation.
She is perceived to be of Aboriginal appearance, approximately 30-40 years old with a solid build, wearing a blue floral dress and white head scarf.
Police are urging anyone who recognises the woman or anyone with information that could assist with inquiries to contact Crime Stoppers on 1800 333 000 or make a report online at www.crimestoppersvic.com.au