Career: 1974
Debut: Round 15, 1974 v Richmond, aged 22 years, 54 days
Games: 5
Goals: Nil
Last game: Round 19, 1974 v Footscray, aged 22 years, 82 days
Guernsey No. 22
Height: 178cm (5'10")
Weight: 85 kg (13.7)
DOB: May 20, 1952
Wearing guernsey #22, O'Halloran played 5 games for Carlton after crossing from Footscray in 1974 where he played 13 games for 2 goals in his time at the Bulldogs (1972 to 1974). O'Halloran shared his debut with Alan Mangels.
O'Halloran was originally from Ulverstone in Tasmania.