Missing Melbourne man Jake Lyon may have met with foul play.
Police are searching a Springvale park hoping to find something that will lead them to the 20-year-old who has been missing since August.
Detective Inspector Jill Dyson from the cold case and missing persons squad says Mr Lyon was last seen at his Dandenong North home and hadn't been in contact with family or friends.
His bank accounts have also not been touched.
"I think four months is a very long time, so to me that makes it suspicious," Det Insp Dyson said.
Mr Lyon's car, a Holden Astra, was found at Warner Reserve six days after his disappearance and police believe it may have been there since the day he vanished.
Det Insp Dyson said police were focusing Tuesday's search on the area where the car was found, including a culvert and a lake.
It's unclear if Mr Lyon went to the park to meet someone, and police don't know whether Mr Lyon was taken from the car or left of his own accord.
Det Insp Dyson said there was nothing in Mr Lyon's background that would indicate foul play and he did not have the resources to set himself up somewhere else.
They've not ruled out self-harm, but say they would have expected to find some evidence if that was the case.
With just two days before Christmas, Det Insp Dyson said Mr Lyon's family were distressed and looking for answers.
"We will continue to investigate until we find out what happened to Jake," she said.
Information received by police within the past month is being investigated, but no suspects have been identified.
Police are believed to have taken items from Mr Lyon's home, but were unable to comment other than to say they are not pursuing computer evidence.
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