One month later, police still have no idea how he died.

There were no visible signs of injury and the results of his autopsy were inconclusive.

But police have pinpointed his last known movements and released security footage of him and his car to see if anyone saw anything in the lead-up to his death.

Mr Dawlat was last seen parking his car on Gifford Street, Silverwater, on Sunday, December 27, about 4.30pm.

Four days later, his body was found face down in the Duck River - close to where he left his car. He was wearing dark adidas shorts and a dark Everlast T-shirt.

Detectives have also released footage of Mr Dawlat's silver Mitsubishi Lancer with the number plates BLW33P.

Water police retrieved the body from the river at Clyde near an old oil refinery close to Silverwater Correctional Complex.

He was identified after a friend recognised his tattoos, including one that read "JD" on his right hand.

"It's an unusual situation, but we are not treating it as suspicious; it's just unusual," Rosehill police acting crime manager Adam Wharfe said.

The body was found close to where Darren Galea's body was found under the Duck River Bridge in Auburn.

Mr Galea, 34, was shot in the head at close range two years ago in what police said was most likely a case of mistaken identity.

Police are urging anyone with information to contact Crime Stoppers on 1800 333 000.

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