Chilling footage of Teacher's Pet killer Chris Dawson was revealed in a comment he made to police before an interview.
Dawson told officers at a Queensland Police station in 1991 that "I was always prepared to be interviewed" around nine years after his wife's strange disappearance.
A police officer responded with "I'm sure you were" before conducting the rest of the interview.
In the interview, Dawson gave his version of events and said Lynette had been talking to a man "tied to a religious sect of some sort" in the weeks leading up to her death.
Eventually, after their "marriage problems" caused him to take some "time away" in 1981, Lynette went missing when he was supposed to meet her at some swimming baths.
Prosecutors later said the time he was away from Lynette before she disappeared was time spent with a 16-year-old girl known as 'JC' for legal reasons.
He said to police about his arrival at the baths: "I sort of [was] asking where my wife was. The girl that worked in the shop called me over and said there was an STD phone call for me, she had taken the call.
"I went there, took the phone call, it was Lyn. She said she needed time away like I had had prior to um, that day and she'd ring me in a few days' time after she'd had time to sort things out."
The ex-Rugby star was accused of killing his wife Lynette Dawson in 1982 so he could go and be with his teenage lover, but her body was never found.
Now 74, he denied killing Lynette and continues to claim she left to join a religious group and abandoned him and his children.
With 40 years passing since her disappearance, Dawson was finally found guilty in a judge-only trial by Supreme Court Justice Ian Harrison.
The prosecution case against him claimed Dawson killed his wife so he could continue an affair with 16-year-old school girl JC, whom he met while working as a PE teacher at Cromer High School.
As JC began to want out of their relationship, Dawson is said to have become increasingly desperate.
Justice Harrison said: "I'm satisfied that the prospect that he would lose [JC] so distressed, frustrated, and ultimately overwhelmed him that... Mr Dawson resolved to kill his wife."
The prosecution said around December 22, 1981, Dawson and JC travelled to Queensland to start a new life but the teenager eventually said she wanted to return home.
She then told Dawson she wished to end the relationship, though they spent Christmas and New Year's Eve together.
On New Year's Day or January 2, 1982, she travelled north to South West Rocks to go camping with her sisters and friends.
He eventually travelled to pick her up from her trip, telling her: "Lyn’s gone, she’s not coming back, come back to Sydney and help look after the kids and live with me."
It wasn't until six weeks later that Lynette was reported missing.
Joanne moved into Dawson's home after the Lynette's disappearance and told the court in the recent trial she was treated as a sex slave and was scared for her life.
They married in 1984, before eventually divorcing in 1993.
Dawson appeared to have gotten away with his crimes before police began re-investigating it. In 2018, a popular podcast by Australian investigative journalist Hedley Thomas said that new evidence had been uncovered and mistakes were made by investigators.
Two separate inquests found him responsible for the death of his wife, but he was not charged by police.
