He played college football for the California Golden Bears and was selected by the Oakland Raiders in the second round of the 2002 NFL draft.

[citation needed] Walker attended Bishop O’Dowd High School where he was an all-state offensive lineman, having helped Bishop O’Dowd to a 10–1 record as a senior after an 11–2 mark the previous year.

He blocked a potential game-winning field goal against the Denver Broncos on November 28, 2004.

[2] Walker was the starting right tackle for the Bills since coming to Buffalo as an unrestricted free agent March 2, 2007.

[2] Despite being expected to replace Jason Peters at left tackle in 2009,[3] the Bills released Walker after failed attempts to trade him on September 8.