Chris Dawson was "calm" but "a little taken aback" when he was arrested in Queensland on Wednesday morning in connection with the death of his first wife, Lyn, police said.
The 70-year-old was arrested in Queensland and is being extradited to New South Wales.
Some of the additional material surfaced as a result of The Australian newspaper's investigative podcast The Teacher's Pet.
Mother-of-two Lyn Dawson, was last seen on Sydney's northern beaches 36-years-ago.
Her husband Chris Dawson, a former PE teacher, moved his schoolgirl lover into the family home just days after his wife went missing.
"They were predominantly statements from witnesses that helped us to tie pieces of the puzzle is together", he told reporters.
"We won't give up on trying to identify the whereabouts of Lynette Dawson, but, from our perspective, it is not crucial to finalising the matter".
Lyn Dawson's family are seeking privacy at this time, but are relieved.
Dawson's disappearance has remained unsolved for 37 years.
In September investigators spent nearly a week digging up the Dawsons' former Bayview home but found no human remains and no significant clues.
Lynette Dawson's brother Greg Simms said he was "quite emotional".
Image Lynette Dawson's disappearance has been the subject of a popular podcast
He is expected to be charged with Lynette Dawson's murder.
"As a result of the investigation and as a result of information that has come from the public, this week we received wonderful information from the DPP that there was sufficient evidence to prosecute", he says.
As fans of the podcast will know, her husband Chris, a former rugby player and PE teacher at a local high school has always been suspected of involvement. She was aged 33 at the time.
Magistrate Dennis Kinsella denied Mr Dawson's bail application, saying he was an unacceptable risk of failing to appear.
"I have said from the start, what is important to me was just as important for Lynette Dawson and her family", he said.
Meanwhile, Chris Dawson's family has released a statement proclaiming his innocence.
"There is clear and uncontested evidence that Lyn Dawson was alive long after she left Chris and their daughters", they said in a statement.
Homicide Squad Commander, Detective Superintendent Scott Cook, praised the work of Strike Force Scriven investigators.
Detectives from the NSW homicide squad began reinvestigating her suspected murder in 2015 and sent a brief of evidence to the Director of Public Prosecutions in April this year.
Mr Dawson, who was also a highschool Physical Education teacher, was taken into custody at a home in Biggera Waters on the Gold Coast just before 8am on Wednesday.
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