Police are trying to piece together the final hours of a Victorian man who drowned in the River Derwent at Hobart's waterfront.
The body of the 32-year-old, who was on a business trip, was pulled from the water at Victoria Dock around 6am on Thursday.
He had been spotted struggling in the river roughly an hour and a half earlier by a jogger who called police.
When officers arrived the man had disappeared under the surface.
"What we're concentrating on at the moment is a timeline between 1.30am and 4.30am," Tasmania Police Acting Inspector Darren Latham said.
"We still can't determine the movements of this man ... (and want) to determine why and how he's ended up in the water."
Police have formally identified the man and told his family of his death, which is not being treated as suspicious.
Investigators believe'he was with work colleagues earlier in the evening.
Police are asking any member of the public who may have seen the man in the hours before his death to come forward.
He has been described of Asian appearance, slim build and clean shaven with short dark hair and was wearing black slacks, a blue long-sleeve business shirt, grey linen jacket and brown RM Williams Boots.