 Upon the formation of Major League Soccer (MLS) in 2006, Walker was drafted 28th overall in the 1996 MLS Supplemental Draft, and became a third-string goalkeeper of the 1996 Dallas Burn, behind Mark Dodd.Unhappy with his situation, he left MLS and played for the now-defunct Jacksonville Cyclones of the A-League.On a recommendation, Walker went to Chile and signed with First Division Club, Universidad Católica.