The father of a tattoo artist murdered by his wife and her lover has told the Hobart Supreme Court of the pain from losing two of his sons within six months.
Bradley Scott Purkiss and Margaret Anne Otto on Monday were both found guilty of the murder of Dwayne "Doc" Davies in May 26, 2017.
Crown prosecutor Madeline Wilson said the crime was the result of longstanding grievances between the trio.
She said Mr Davies on the night of his death had been lured to the Elderslie property where Purkiss lived and was most likely shot in the back while inside an outdoor shed and then shot in the head at point-blank range.
"This crime was a cold, calculated execution," Ms Wilson said.
She said his body was most likely left in the padlocked shed overnight before it was wrapped in a tarp and dumped in a shallow grave at Levendale.
Purkiss reacted angrily during Ms Wilson's summary to the court.
"Load of s--t - you've got it so wrong," he said.
The victim's father Glen Davies told the court on Monday it had been traumatic for the family to sit through the graphic detail of his son's murder over the five-week trial.
"I'm the first to admit that he was no saint ... but he was my son and I love him very much," he said.
Mr Davies described his son as a good man with a big heart and moral standards.
He spoke of the pain of losing one son to natural causes and another son to murder in the space of six months.
"Parents are not meant to bury their children," Mr Davies said.
Otto cried with her head placed in her hands as Mr Davies told the court he once considered her his other daughter.
"It was inconceivable that she had evil in her and could play a part in the murder of my son," he said.
"My grief is inescapable and I doubt I will ever get over the loss of my son."
A statement was read out on behalf of Dwayne Davies' sister Kelly Goss who said she "felt riddled by the sickness of sadness".
In sentencing submissions, defence lawyer Greg Melick said Otto had been subject to emotional abuse by her former husband who had also put the family's finances under strain through his drug abuse.
He said Otto did not contemplate her complaints about Mr Davies' behaviour to Purkiss would result in murder.
The pair will be sentenced on Wednesday at 4.15pm.