Chris Dawson has been arrested on the Gold Coast over the death of his wife, Lynette, who disappeared from their Sydney home nearly 37 years ago.
The dramatic development follows revelations in the The Australian's investigative podcast series, The Teacher's Pet.
Ms Dawson was 33 when she went missing from Sydney's northern beaches in January 1982, leaving behind two young daughters.
Detectives from the NSW homicide squad began reinvestigating her suspected murder in 2015, calling on the Office of the Director of Public Prosecutions to review their brief of evidence in April this year.
A 70-year-old man was arrested at Biggera Waters on Wednesday morning and will appear in Southport Magistrates Court where NSW Police will seek his extradition.
Dawson, a former Newtown Jets rugby league player, has long been a suspect in the case but denies any involvement in his wife's disappearance.
In September, police dug up the backyard at the Bayview home the couple had shared but did not find remains or items of interest.
Lynette Dawson's family have been made aware of the arrest and police will address journalists on Wednesday.