A murderer who colluded with his girlfriend to make it appear his victim was still alive has been sentenced to jail.
Mayfield man Ian Rosewall pleaded guilty in March to murdering Tyson Timothy Clark-Robertson.
On July 16, 2016 - the day of the murder - Mr Clark-Robertson and Rosewall were drinking and smoking marijuana. The pair started to hang makeshift curtains in their Mitchell Street house when Mr Clark-Robertson told Rosewall to "get me another cone, you paedo dog".
Rosewall "lost it" because he felt the comment was an insult about the age gap between him and girlfriend Renae Lorraine Donald.
"Angry as hell", Rosewall picked up a hammer being used to hang the curtains and hit Mr Clark-Robertson at least four times to the back of the head.
Mr Clark-Robertson convulsed on the floor briefly and then stopped moving.
Rosewall put the victim's body in a shed in the backyard and then buried him in a shallow grave within a week of the murder.
The 24-year-old victim's highly decomposed body was discovered nine months after he was killed because Rosewall and Donald used Mr Clark-Robertson's phone to message his family and friends.
The couple told police Rosewall was meeting up with the victim to give him his Centrelink payments that were being deposited into Donald's account.
But it was revealed Rosewall and Donald spent almost $17,000 of Mr Clark-Robertson's payments on themselves.
Donald pleaded guilty to being an accessory after the fact to the murder of her ex-boyfriend. The 21-year-old will be sentenced for her role later this year.
During sentencing submissions in the Launceston Supreme Court on Thursday, Justice Robert Pearce asked Rosewall's lawyer if there was anything mitigating.
Defence lawyer Patrick O'Halloran said his client's guilty plea, as well as his acceptance of wrongdoing and remorse articulated through a psychiatrist report.
Crown prosecutor John Ransom said the delay in admission meant the state had to prepare a complicated murder trial and brief witnesses.
Justice Pearce said the guilty plea carried almost no weight because Rosewall put his own interest ahead of Mr Clark-Robertson's welfare.
Rosewall also pretended the victim was still alive, causing a terrible and traumatic impact on Mr Clark-Robertson's family.
Rosewall was sentenced to 22 years' jail, backdated to his arrest on April 11.
The murderer will be eligible for parole after 12.5 years.