[2] Prior to joining the Sooners staff, Walker spent two seasons as the defensive coordinator at Division III Mississippi College.
The New Orleans, Louisiana, native worked as a defensive quality control coach for three seasons with the Miami Dolphins (2005–2007).
Before moving to the NFL, Walker spent two seasons as a defensive assistant on Nick Saban's staff at Louisiana State University.
Walker served as a graduate assistant at Louisiana-Monroe and West Virginia before landing at LSU.
He began his coaching career as a student assistant at LSU in 2000 after graduating with a degree in education.