Victorian police say solving the suspected murder of a man missing for almost three years will be difficult.
Thirty-year-old Trevor Tascas of Geelong disappeared in August 2005, but a friend recently told his mother they heard he had been murdered.
Homicide detectives have checked the information and say it is credible.
Detective Senior Sergeant Ron Iddles says the passage of time makes the investigation difficult.
"In that period of time you've got things like the destruction of evidence and a whole range of issues," he said.
Police say he was dealing heroin and amphetamines at the time of his disappearance.
Detective Senior Sergeant Iddles says it will be tough to trace Mr Tascas' final movements.
"One of the things when you're dealing drugs, you're constantly changing your phone numbers and it's difficult for us to actually piece together his movements." he said.
"We desperately need to locate the house that he moved to in East Geelong and that might then give us a further start."
His mother Pamela Tascas only reported him missing last January.
"Someone would always say they seen him, or you know, he's doing well," she said.
Mr Tascas' car, a maroon Holden Calais, and dog are also missing.