CCTV released of Syd man's last movements

Footage of the last movements of a man found dead in a river in Sydney's west has been released by police who continue to investigate the mysterious death.

Jaafa Dawlat's body was found floating in Duck River next to an old oil refinery by a fisherman late last year.

The 27-year-old was identified by a friend who contacted police on New Year's Eve but detectives have struggled to establish the cause of the Auburn man's death.

The CCTV footage released by police on Thursday shows Mr Dawlat's last movements as well as images of a car whose occupants may have information about how Mr Dawlat died.