David Dick was brutally attacked without warning when he stepped out of a lift in the Doncaster shopping centre last Friday morning.
But Homicide Squad detectives released security footage on Tuesday that captured a suspect in the centre's car park in the same location, at the same time both on Friday and the day before.
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Police have released vision of a suspect wanted over the fatal attack of David Dick at the Doncaster shopping centre last Friday.
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CCTV: man wanted over fatal attack in Doncaster
Police have released vision of a suspect wanted over the fatal attack of David Dick at the Doncaster shopping centre last Friday.
Members of an early morning gym group found the fatally wounded Mr Dick near a lift lobby in the car park at 6.10am, shortly after he was attacked.
There is no known motive for the attack, police said.
"Investigators believe the footage indicates that the suspect is likely to have targeted David," Victoria Police spokeswoman Natalie Webster said.
The man then fled down a fire exit before heading south from the car park towards Doncaster Road.
Investigators believe the offender is likely to have injured his hand during the attack and may have sought medical treatment.
The Caucasian man appeared to be aged in his 30s, about 176cm tall with a solid build and mousy brown hair.
Footage from Thursday shows him wearing a grey hooded jumper, tracksuit pants and runners, and he was carrying an item with a long yellow cover.
The man is believed to have been in the vicinity of the shopping centre's car parks between 5.45am and 6.10am on Thursday, February 2, and again during the same time on Friday, February 3.
Detectives have released an image of Mr Dick in the hope someone can provide further information on his movements on the Thursday and Friday.
Detective Inspector Michael Hughes said there was someone out there who knew what had happened to Mr Dick.
"This was an incredibly brutal attack and David's family is devastated by his death," he said.
"We're keen to speak to anyone who recognises the man shown in the footage and has information about his movements in the lead up to the fatal attack."
Anyone who recognises the man or has further information is urged to call Crime Stoppers on 1800 333 000 or submit a confidential crime report at www.crimestoppersvic.com.au.