Adam John Charles Evans, 36, faced Brisbane Supreme Court on Wednesday for sentencing after having pleaded guilty to robbery in company, manslaughter, interfering with a corpse and four counts of rape.
The charges relate to a four-day period that included Evans bashing 61-year-old Kym Mitchell to death in a unit at Yeronga in Brisbane's south on November 26, 2018.
Evans had earlier that day joined with Robert Louis Gibson, 43, in robbing a 28-year-old woman while she was walking across a railway overpass.
Crown prosecutor Elizabeth Kelso said there was "no recognisable motive" for why Evans had attacked Mr Mitchell, who was known to him and used a mobility scooter.
"The neighbours heard sounds of fighting and someone saying 'I'm dying, help me'," Ms Kelso said.
Mr Mitchell was found days later in a wheelie bin after Evans and Gibson had cleaned bloodstains off the unit's ceiling and dumped the mobility scooter in a river.
Mr Mitchell was struck multiple times on the head with severe force that fractured his skull and eye socket.
His back was also likely kicked or stomped while he lay on the ground.
Evans told people he had "flogged" Mr Mitchell and then "gone too far and was now going away for 25 years".
At 4am on November 30, 2018 Evans and Gibson followed a 21-year-old woman as she left a tavern.
Gibson told the woman: "We just beat the f*** out of a guy. He's dead. I'm a murderer".
The woman was pushed to the ground and Gibson told her "if you don't do it, end up murdered like the man" before being raped by Evans and Gibson.
Gibson was sentenced in May 2022 to 11 years' imprisonment for robbery, rape and accessory after the fact to manslaughter.
Defence barrister Justin Thomas said Evans had suffered trauma as a young man that resulted in drug abuse and mental health issues his entire adult life.
"He had not engaged in routinely violent behaviour before this very serious offending ... intoxication played a significant part," Mr Thomas said.
Justice Glenn Martin told Evans he had treated Mr Mitchell's body in an inhumane and disgraceful way.
"For no reason supplied to the court you have killed a man 30 years older than you and suffering a disability," he said.
Justice Martin said he could not find Evans showed remorse for having raped the young woman.
"The rapes were brutal and frightening. The (victim) would have been in fear for her life," he said.
Evans was sentenced to a cumulative 18 years' imprisonment that included 10 years for manslaughter and eight years for the rapes, with all five charges being declared serious violent offences.
Evans will be required to serve 80 per cent of the sentence before being eligible for parole.
His five years and 10 months already spent in custody were declared time served.
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