Victorian Jonathan Dick is wanted over the February 3, 2017, murder of his brother David Dick in Doncaster, and a hammer assault on a man in Keilor five months later.

Two years on from his brother's murder, Jonathan Dick's whereabouts remains a mystery, despite a $100,000 reward being offered last October.

Detective Inspector Tim Day said despite 300 calls from members of the public the only confirmed sighting of Jonathan Dick has been his August 2017 assault on a male associate.

"Investigators believe that Jonathan is avoiding detection by using parks and reserves as access routes, and he may possibly have access to a bicycle as a mode of transport," Det Insp Day said in a statement on Saturday.

"Jonathan might also be using abandoned houses and buildings for shelter."

Judging by footage of the Keilor assault, detectives believe Mr Dick has been "hiding in plain sight", is earning money and is not living on the streets.

"We know that Jonathan is not a man who stands out and he is probably taking care to ensure he doesn't," Det Insp Day said.

He is described as being in his 30s, Caucasian, about 176cm tall with a solid build and mousy brown hair.

Mr Dick also has two distinctive tattoos. One is a Wolverine v Sabre-tooth inking on his right thigh extending to his knee and the second on his left calf depicts the Incredible Hulk.

Police are urging anyone who sees him to call triple zero and not approach him but to keep him in sight.

Australian Associated Press