More than one person is believed to have been involved in killing a man and putting his body in a sewer in Brisbane's eastern suburbs two years ago.
Police are offering up to $250,000 and possible legal indemnity to anyone who can provide information about the death of Jason Guise, whose body was found in a sewer pit well in Wynnum on May 8, 2019.
Acting Detective Inspector Mark Mooney says more than one person is suspected to have been involved in killing the 45-year-old and moving his body.
"We believe there might be more than one person involved, at some point in time, in relation to Jason's death and we ask those people to come forward whether you have (been involved) before, during, or after Jason's death, please come forward with that information," he told reporters on Wednesday.
Mr Guise was seen at a 7-11 store at Tingle Rd in Wynnum about 2.43pm on April 21 before he was seen on CCTV walking past Woolworths on Florence St.
Police believe he returned to his home on Bride St before going to a food van for the homeless on the corner of Tingle and Charlotte streets.
Mr Guise is believed to have received a food package there before he was last seen alive riding a pushbike past the the Waterloo Bay Hotel on Berrima St about 7.20pm.
He was reported missing to police 12 days later.
"This is the last sighting of Jason. Jason hasn't been seen since this time," Det Insp Mooney said.
"However, we do believe that he's returned home from this location as the clothing we located him in is different from the clothing he was wearing in this footage."
He said investigators also believe Mr Guise died somewhere other than the sewer where his body was found.
Given his weight and the difficulty in accessing the sewer well, which was under lock and key and ringed by a 2.4m fence, at least two people are suspected to have been involved in moving his body.
Det Insp Mooney said police are offering legal indemnity to anyone who can provide information, but was not involved in the actual death of Mr Guise.
He said Jason's father Barry Guise, who lives in Western Sydney, has been waiting almost two years to find out what happened to his son.
"Jason's family and friends have the right and the deserve to know what happened to Jason on that day," Det Insp Mooney said.
"If you have that information we urge you to come forward right now."