A man found dead in a St Kilda backyard is yet to be identified days after he died, with police releasing images of his distinctive tattoos in a bid to find out who he is.

Detectives from the Port Phillip Crime Investigation Unit are appealing for information after the man's body was found on Wednesday in the rear garden of a house on Barkly Street, just after 9.30pm.

A computer-generated image of the deceased man. Credit:Victoria Police

"An autopsy has been conducted which indicated that the man possibly died from a fall," a police spokesman said.

Inquiries into the circumstances around his death are ongoing and police are yet to confirm whether the death was suspicious.