Walker spent the 2013 season as defensive coordinator under Clark at Jacksonville State. Under Walker's guidance, the Gamecocks' defense ranked fifth in the Ohio Valley Conference in total defense (381.5 yards per game) and second in the league in pass defense (183.8 yards per game).
Jacksonville State had three defensive players earn All-Ohio Valley Conference honors under Walker's direction. Safety Pierre Warren earned first-team all-conference honors, while defensive linemen Chris Landrum and Caleb Lawrence each honored second-team honors.
Walker first served as defensive backs coach under Clark at Prattville High School in 1999 before being elevated to the defensive coordinator position in 2001. While at PHS, Walker ran a defense that helped the team post an incredible 107-11 overall record and a 90.7 winning percentage. Prattville made eight postseason appearances that were highlighted by a pair of state championship victories his last two seasons at the school and a streak of 55-regular season wins.
While running the Lions' defense, Walker was named Defensive Coordinator of the Year in 2006 and helped lead the school to a No. 2 ranking in the nation in the USA Today's national high school football poll.
Walker then moved with Clark to the University of South Alabama in 2008, where Walker coached the defensive backs. In 2012, Walker helped lead a defensive unit that finished second in the Sun Belt Conference in total defense.
In 2011, Walker's secondary group helped the Jaguars' defense finish in the top 20 in the NCAA Football Championship Subdivision in both passing and total defense, with the defense allowing 167 passing yards per game and 310 total yards per game.
Walker's defensive back unit combined to intercept 11 passes in 2010 while only giving up 175 yards passing per game. His secondary unit also forced three fumbles and had five players post double-digit numbers in tackles.
In 2009, Walker's secondary recorded 13 out of the Jaguars' 14 interceptions on the season and returned two interceptions for touchdown. The unit also broke up seven pass attempts, forced two fumbles and recovered another two fumbles while four secondary players posted at least 20 tackles on the year.
Walker began his coaching career as a graduate assistant at Troy University from 1997-2000 after a successful playing career at the school. While with the Trojans, Walker worked with the defensive line and defensive backs, helping lead the school to an 8-4 record in his second season, including a spot in the NCAA Division I-AA playoffs.
Walker was a four-year letterman at Troy and played defensive back from 1992-95 for the Trojans. As a true freshman, Walker played primarily on special teams in 1992. During his sophomore season, Walker started several games at safety before starting every game his junior and senior seasons. He helped the Trojans reach the NCAA Football Championship Subdivision (FCS) playoffs in 1993, 1994 and 1995, highlighted by a trip to the semifinals in 1993. During his playing career at Troy, the school posted a 41-7-1 (84.7 percent) overall record.
Walker graduated from Troy in 1996 with a bachelor's degree in human services with a double minor in psychology and biology. He received his master's in counseling from the school in 2000. He is married to Kaylyn Walker and the couple has three sons, Duelle (23), Christian (10) and Caden (8).