A million-dollar reward is being offered to help solve the murder of Victorian man Terrence Black, who police believe was killed near a football ground 18 years ago.
Homicide Squad Detective Inspector Tim Day hopes the reward will lead to answers for Mr Black's family.
It's believed the 59-year-old was killed in a toilet block at the Yarra Junction football ground on May 5, 2000.
His body was found weeks later in the Little Yarra River at the back of a rural property in nearby Gladydsale on June 16.
A $100,000 reward had been offered in 2004 for information leading to a conviction, but police increased it to $1 million on Sunday.
"For the past 18 years Terrence's family have had to live with the thought that those responsible for his death are still out there," Detective Inspector Day said.
"We're hoping that with the announcement of this reward, there are people who reconsider their position and come forward and assist us."
At the time of his death, Mr Black was a pensioner and lived at the Yarra Junction caravan park.
He had been married and later divorced, and had a son and a daughter.
Detectives believe the case is solvable and wish to speak with anyone about Mr Black's movements on the day he was likely killed.
"Any piece of information could prove crucial in solving this case," Detective Inspector Day said.
Mr Black was the oldest of four siblings and his sister Pam and brothers Steve and Lindsey joined police in the appeal for information.
A reward of up to $1 million will be paid at the discretion of police for information leading to the arrest and conviction of anyone responsible for the murder.