A New South Wales State of Origin representative forward, he previously played in the NRL for the Canberra Raiders and the Wests Tigers.

A Hunter Mariners junior,[6] O'Hara made his NRL début as a 20-year-old and won the Canberra Raiders' Rookie of the Year award in 2001.

Having joined the premiership-winning Wests Tigers at the close of the 2005 NRL season, O'Hara first played for them in the 2006 World Club Challenge loss to Bradford Bulls in England.

He was bought by coach Tim Sheens to add some size to the small Wests Tigers pack and was a regular in first grade in 2006, playing in 22 games.

"[10] Later in 2014, O'Hara joined The Entrance Tigers in the Ron Massey Cup, co-captaining them to a grand final victory.