The 31-year-old, who competed at the 2000 Sydney Olympics, died in the early hours of the morning when his car rolled over after veering off the road.
"Although we're still in the early stages of the investigation it appears as though the man was travelling east on the Arnhem Highway when the vehicle left the road, crashed and landed 10 metres off the road," said Northern Territory police detective John Worrall.
Batman was divorced from Nova Peris-Kneebone who won Olympic hockey gold for Australia in Atlanta in 1996.
His best competitive performance was sixth place at the 2003 world indoor championships.
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