Originally from Busselton, Walker represented Western Australia in the Teal Cup and was selected in the Under-18 All-Australian team.
[1] Due to a knee injury, however, he was unable to make any senior appearances for the West Coast Eagles.
Collingwood gave up the 12th selection of the 1994 AFL Draft to secure Walker, a pick which the Eagles used on Shane Sikora.
[2] He continued to be hampered by injuries at Collingwood but was able to play 16 AFL games in three seasons from 1995 to 1997.
[4] After being delisted he nominated for the 1998 AFL Draft and was re-signed by Collingwood, but he would only play reserves matches.