The man known as "Australia's greatest detective" has handed in his badge, saying he'll miss the camaraderie but the time is right for him to call time on his career.
Ron Iddles, who grew up on a dairy farm in Rochester, stepped down from his role as secretary of the Victorian Police Association last week.
The decorated former homicide detective had a 99 per cent court conviction rate, investigating more than 300 cases.
He told 3AW’s Neil Mitchell the cases he hadn't solved still irked him.
"There's probably three or four jobs that I'm reasonably confident that I know who's responsible, but the evidence is not there, or they have an alibi," the outgoing police association secretary said on 3AW last week.
"It's frustrating because we had a saying in the office that failure wasn't an option."
Mr Iddles said he thought Victoria was "at times" too soft on offenders and that the police force faced several issues moving forward.
He said the threat of terrorism was a constant concern.
"It will happen and it'll happen in Melbourne," Mr Iddles said.
"It's just a matter of when."
Click PLAY below to hear the full interview on 3AW Mornings