WA Police are calling for a woman to come forward, claiming she may have vital information in an ongoing investigation.
Sex Assault Squad detectives said the woman boarded a Transperth bus from the bus stop located on Price Street and South Terrace in South Fremantle at around 11:10pm on 8 July 2018.
She exited the bus with another woman on South Terrace near Essex Street.
Both woman stopped at a café on South Terrace before walking to the Norfolk Hotel.
They caught a ride share vehicle to Bicton just after midnight.
Police urge the woman or anyone who knows her identity to contact them through Crime Stoppers on 1800 333 000 or make a report online at www.crimestopperswa.com.au.