McMullin, an ex-Old Melbournian footballer, was recruited by Collingwood in the 1980s. As a half-forward he was a noted goal-kicker. In 1987 he was delisted from Collingwood. McMullin was drafted by Essendon in the 1990 Pre-Season Draft. After a few years at the Bombers, Collingwood showed interest once again, drafting him in the 1992 Mid-Season Draft, but McMullin only played another year; McMullin was released by Collingwood in 1993, after playing one game.
Victoria 17.14 (116) defeated Tasmania 14.20 (104), at North Hobart Oval, 28 May 1991
Queensland 23.14 (152) defeated Victoria 15.8 (108), at The Gabba, 16 July 1991