A Tasmanian woman who plotted with her former lover to murder her husband to end an unhappy marriage will spend at least seven and a half years in prison.

Margaret Anne Otto, 47, was today sentenced to 15 years in prison for the May 2017 murder of Dwayne "Doc" Davies, with a non-parole period of half that.

Bradley Scott Purkiss, 43, who the judge described in the sentencing hearing as Otto's confidant, was sentenced to 24 years in prison for his role in the murder. He will be eligible for parole in 14 years.

On Monday, a Supreme Court jury found Otto and Purkiss guilty of the murder of Mr Davies, a Tasmanian tattoo artist.

The jury heard the pair plotted to kill Mr Davies by luring him to a shed at Elderslie before Purkiss shot him in the head and back at close range and buried him on a remote property.

Police later found Mr Davies's body wrapped in a tarp and buried in a shallow bush grave, concealed by green waste on a remote property at Levendale.

Murder was a 'betrayal', judge says

Handing down the sentences, Chief Justice Alan Blow described the murder as an "outrageous killing" that had left Mr Davies's family feeling "devastated and destroyed".

"The murder involved betrayal, betrayal by Ms Otto of her husband, and by Mr Purkiss of a close friend," Chief Justice Blow said.

He said it was clear Otto had a difficult relationship with her husband and she wanted him out of her life.

"It seems she reasoned that if he was killed, she would be free of him and he would never trouble her again," he said.

Chief Justice Blow said Mr Davies was "an unstable and demanding individual" and she had complained to police of "years of emotional abuse".

He said Otto and Purkiss were not in a sexual relationship in 2017, and did not intend to live together after the murder, but Purkiss wanted to free Otto from a difficult marriage.

Dwayne Davies's family gather outside the Supreme Court in Hobart. ( ABC News )

Chief Justice Blow said Purkiss felt used by Mr Davies, who had consumed substantial amounts of cannabis Purkiss supplied, without paying for it.

"Mr Purkiss was annoyed about Mr Davies owing him a great deal of money, mainly for purchases of cannabis, and about that debt being outstanding for a long time," he said.

As Chief Justice Blow read out his remarks, Otto trembled, breathing heavily, and began to sob silently.

She kept her eyes closed or downcast throughout her appearance.

Purkiss looked straight at the judge for most of his remarks, occasionally glancing down.

Pair had year-long affair, and grievances

During the trial, Crown prosecutors told the court Otto and Purkiss, who had a year-long affair, were motivated by "long-standing grievances" including an unhappy marriage, financial issues and a feeling of being used.

Over five weeks, jurors heard evidence from almost 50 witnesses, examined more than 100 exhibits and watched several days' worth of police interviews.

Speaking outside court, family members said they were satisfied overall with the sentences handed to Otto and Purkiss.

"I would have liked some more, but we're happy with what we got," Mr Davies's father, Glen Davies, said.

"Nothing is going to bring our boy back to us."

"I'm a little upset on hers, I thought hers would have been a little longer, but there you go."

Both Otto and Purkiss's sentences were backdated to mid-2017.

Purkiss was also sentenced to four and a half months in prison for drug offences, to be served concurrently with the murder sentence.