It's been a year since Kerry Giakoumis was supposed to travel home to Adelaide on a flight booked by his mum.
He'd travelled to Melbourne five days earlier, telling family he planned to work there as a concreter.
Mr Giakoumis never boarded the flight and on the first anniversary of his disappearance homicide investigators have launched a fresh appeal for information to find him.
The 29-year-old had travelled to Melbourne on June 5 with two associates who Victoria Police believe are members of the Hells Angels Outlaw Motorcycle Gang.
The last sighting of Mr Giakoumis was at the Hells Angels clubhouse in Thomastown in the early hours of June 10.
Police say they're almost certain he met with foul play and want to know what happened at the clubhouse - or any other location - in the early hours of that Wednesday morning.
Hells Angels members and other associates were believed to be there at the time. It's understood the Adelaide man was not a patched member of the club.
Homicide investigators searched a number of properties in June last year, including the Lipton Drive clubhouse in Thomastown, while following several lines of inquiry but have so far been unable to find trace of Mr Giakoumis or charge anyone in connection with his disappearance.
"Someone out there know what happened to Kerry and why - and we are hopeful they are ready to talk to us," Detective Inspector Andrew Stamper said.
He was in regular contact with his family throughout his time in Melbourne.
Police have released several images of the missing man at a South Australian convenience store on the day he left the state and in a taxi in Melbourne a day later.