[2] After graduating from high school Walker played for head coach Charlie Spoonhour at Saint Louis and started 73 games for the Billikens.
[3] Alongside future NBA lottery pick Larry Hughes, Walker helped the Billikens reach the second round of the 1998 NCAA Division I men's basketball tournament before losing to eventual national champions Kentucky Wildcats.
[4] Walker's coaching career began as a varsity assistant at Alton High School in the Metro East area of Illinois during the 2000 season before serving in the same position at F. L. Schlagle High School in Kansas City, Kansas from 2001 to 2002.
[3][4] From 2003 to 2004 Walker spent two seasons as an assistant coach at Redlands Community College in El Reno, Oklahoma.
[5] Walker later moved to work as an assistant coach at Ball State under Tim Buckley for two seasons.