The Teacher's Pet murderer who killed his wife to be with his teenage babysitter has been jailed for 24 years.
After years of speculation about the disappearance of Lynette Dawson in 1982, former rugby league star Chris Dawson was convicted in August.
A judge found the 74-year-old killed Mrs Dawson to allow him to continue a relationship with his teenage lover and babysitter.
Dawson is to appeal against the conviction, according to his lawyer.
Mrs Dawson vanished from her home in Sydney home and her body is still missing with all the evidence circumstantial in the trial.
Justice Ian Harrison said in sentencing, the crime was "self-indulgent brutality" .
He also added that it "was neither spontaneous nor unavoidable".
Dawson, he said would be allowed to apply for parole in 18 years, but the judge said he would likely die in prison.
The accused was charged in 2018 after a podcast called The Teacher's Pet attracted global attention and sparked a renewed investigation which built enough evidence to charge Dawson.
During the trial the accused denied being involved in his wife's disappearance and insisted she abandoned him and their two children and was thought to have joined a religious group.
In August Justice Harrison said evidence against Dawson was "persuasive and compelling".
He then found Dawson was obsessed by his teenage lover, known only as JC for legal reasons.
Dawson taught at a school where she was a student and wanted her as a "replacement" for his wife Lynette according to the judge.
Justice Harrison said Dawson had become increasingly desperate other plans to leave the marriage failed and JC wanted the relationship to end.
Shanelle Dawson, the daughter of the accused, pleaded for the location of her mother's body at an earlier hearing, saying: "Please tell us where she is."
Ms Dawson was only four when her mother vanished.
She said: "The night you removed our mother from our lives was the night you destroyed my sense of safety and belonging in this world for many decades to come.
"Why didn't you just divorce her, let those who love and needed her keep her?"
The victim's brother Greg Simms, spoke after sentencing.
He said: "We really didn't believe this day would ever come. What we need now is to find Lyn and put her to rest."
After being questioned whether Dawson would reveal her body's whereabouts, his lawyer Greg Walsh insisted his client maintained his innocence.
The Mirror reported Dawson was finally caught after police found women's clothing in his back garden and evidence from a podcast prompted police into action.
The New South Wales government in Australia passed laws where it is impossible for convicted murderers to secure parole if they refused to pinpoint the location of victims' remains.
