Fed up with an abusive marriage, Margaret Anne Otto plotted with her one-time lover to kill her husband.
Hobart tattoo artist Dwayne "Doc" Davies, 47, was lured to a rural property in southeast Tasmania under the guise of looking at Harley-Davidson motorcycles.
There, on May 26 in 2017, he was shot in the back and head at point-blank range.
The man who invited him over and then pulled the trigger was his close friend Bradley Scott Purkiss.
On Wednesday, Otto was sentenced to 15 years' jail and Purkiss 24 for the "outrageous" crime.
"The murder involved betrayal. By Ms Otto of her husband and by Mr Purkiss of a close friend," Chief Justice Alan Blow said in Hobart Supreme Court.
"Mr Purkiss took advantage of Mr Davies' friendship and trust."
Otto and Purkiss went to a birthday party for Mr Davies' grandson the day after the murder, telling his loved ones they were worried about his apparent disappearance.
Mr Davies' body was discovered a week later buried in a shallow bush grave under green waste at Levendale, about an hour's drive from where he was killed.
Otto and Mr Davies were together for 17 years and married for four, but their relationship was marred by years of emotional abuse.
Mr Davies was an unstable and often demanding individual.
"She wanted him out of her life," Justice Blow said.
"It seems she reasoned that if he was killed she would be free of him and he would never trouble her again."
Otto and Purkiss, who the court previously heard had an affair that ended the year before the murder, spoke on the phone and met at her work on the morning of the killing.
They both held "grievances" against Mr Davies, who owed a substantial drug debt to Purkiss.
The murder was planned at least eight hours before the fatal shot was fired.
"During that time Mr Purkiss could have changed his mind and Ms Otto could have intervened to save her husband's life," Justice Blow said.
Purkiss, 47, and Otto, 43, were on Monday found guilty of murder after a five-week trial.
He must serve a non-parole period of 14 years, while she won't be eligible for release until after seven-and-a-half years in jail.
"I would have liked more. But I'm happy with what they got," Mr Davies' father Glen Davies told media outside court.
"But nothing is going to bring our boy back."
Both sentences were backdated to mid-2017.
Australian Associated Press