A $250,000 reward has been offered for information that helps the ongoing investigation of Brisbane man Wayne Youngkin's presumed murder more than three decades ago.
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Mr Youngkin's remains were found in a septic tank at his former home at Brighton in November last year, 31 years after he was reported missing.
Police said the 29-year-old's skeleton was found with "significant trauma" and searched Deagon wetlands in April for possible evidence they believed may have been disposed of in the water.
It emerged earlier this year there was a six-year gap between when Mr Youngkin, who had lived with his late uncle and grandmother, was last seen publicly and him being reported missing.
Police Minister Mark Ryan announced the reward at a press conference in Brisbane on Monday.
"Mr Youngkin went missing in 1986, that's over thirty years that his family and friends have been waiting to find out what happened to him," he said.
"I have approved this reward in the hope that it will prompt someone out there in the community that has been sitting on information about this case for years to finally come forward."
Mr Ryan said police would also consider offering indemnity from prosecution for an accomplice of the alleged murderer who came forward with information on the crime.
Detective Inspector Tim Trezise said police were investigating several lines of inquiry and any information from the public would be welcome.
More than 20 detectives were working on Mr Youngkin's presumed murder.
- With AAP
