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Adelaide Crows coach Phil Walsh died on Friday and South Australia Police are treating his death as murder.
Just after 02:00 local time (14:00 GMT on Thursday), police and ambulance crews attended a domestic dispute call at a house in the Adelaide suburb of Somerton Park, according to a statement on South Australia Police's website.
Despite the efforts of paramedics, Walsh, who was "seriously injured", died at the scene. Walsh's son was arrested as part of the investigation.
"Ambulance crews treated a seriously injured 55-year-old man at the home but sadly he died at the scene. The man's son, aged 26, has been arrested but no charge has yet been laid," the statement read.
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"The deceased's wife sustained non-life-threatening injuries during the incident and is currently receiving treatment in hospital."
Walsh was in his first year of a head-coaching role at the Crows in the Australian Football League (AFL) after being part of the coaching staff at the Geelong Cats and Port Adelaide Power.
The former winger had played 122 games in the AFL - and its predecessor, the Victorian Football League - from 1983-1990, representing the Collingwood Magpies, Richmond Tigers and Brisbane Bears.