Amanda Brown was found by Newman laying unresponsive on the floor of their Docklands apartment at about 8pm yesterday, the Herald Sun reported. She was 50.
A report will be prepared for the coroner and Ms Brown’s death is not being treated as suspicious.
The former Footy Show host told the paper he was “devastated” by the loss.
The couple had been together for 20 years before marrying in November last year.
Newman played 300 games for the Geelong Football Club between 1964 and 1980.