He played for the Baltimore Ravens of the National Football League (NFL) and Texas Tech at the collegiate level.

[3] Smith made his first career start against the Tennessee Titans on November 12, 2006, in place of the injured Ray Lewis.

Smith was cut by Titans' center Kevin Mawae and fell onto his left shoulder.

[7] Smith received an offer from West Virginia University where he was said to have the opportunity to coach the linebackers in addition to having co-coordinator responsibilities, which he accepted.

[9] In late December 2012, Smith was hired to be the co-defensive coordinator and linebackers coach for the Texas Tech Red Raiders.

He reunited with former teammate Kliff Kingsbury, who became the team's head coach earlier the same month.

[11] Smith was hired by the Kansas City Chiefs as their assistant defensive line coach on April 1, 2016.