Bradley Scott Purkiss and Margaret Anne Otto have been found guilty of the murder.
A jury of seven men and five women took five hours to reach the verdict.
The pair have been found guilty of the 2017 killing of Ms Otto's husband Dwayne Robert Davies.
Over the course of a five week trial, the jury heard from 48 witnesses, saw 110 exhibits and viewed 14 hours of video evidence before coming to the guilty verdicts.
First meeting in 2011, Purkiss had been close friends with the victim since 2014.
Otto and Mr Davies had been in a relationship on and off for 20 years, and been married for the four years before the victim's death.
Purkiss and Otto, who had a brief affair in 2016, colluded to kill Mr Davies.
On May 26, 2017, Purkiss lured Davies to his Elderslie property with the promise of viewing two motorcycles.
This was a ruse as part of the murder plan and gave Purkiss the opportunity to shoot Davies twice in a small cannabis grow shed on the rural property.
Purkiss then made an unexpected visit to his father in New Norfolk to arrange a shooting trip to Levendale for the next night where he dumped Mr Davies' body.
Police exhumed Mr Davies from a shallow grave on that Levendale property on June 3, 2017.
Full trial coverage
- Wife and best friend stand trial for tattooist's murder
- Tattooist killed in cannabis grow shed, court hears
- Accused told employer it would be easier if her husband was dead
- Victim sought firearms for friend in weeks before his murder
- Alleged killer's partner was trying to leave relationship
- Accused murderer used to shoot at Levendale
- Court hears of physical altercation before alleged murder victim was last seen
- Accused killer 'debt-free' after husband's disappearance
- Alleged murderer arranged last minute shooting trip to Levendale
- Dwayne Robert Davies 'obsessed' with television anti-hero Walter White
- Accused murderer attended birthday party for alleged victim's grandson
- Alleged killer confident police would find no evidence of foul play
- Accused told police he was being framed for best friend's murder
- Father of accused's information led police to grave site
- Accused took on father role to victim's son
- Court hears of accused killers' secret affair
- Accused denies knowledge of murder plot
- Murdered tattooist shot at close range, court hears
- Jury shown images of grave site
- 'Blood-shedding event' occurred in accused's shed
- Alternative murder site 'can't be ruled out'
- Accused's DNA found on victim's body
- Fingerprints on body unable to be matched
- Explicit images found on accused's phone
- Accused recounts day of alleged murder
- Alleged killer denies affair with co-accused
- Accused murderer denies lying to police
- Jury asked to join the dots
- No motive to kill 'best and only friend'
- Jury to continue deliberating next week