Mitchell attended Los Banos High School, where he was a three-year starter and an All-State selection at both linebacker and Running back.

[1] Mitchell originally signed with the University of Florida, but the Southeastern Conference ruled him ineligible because an issue with his high school transcript.

He led the team with 124 tackles (87 solos), four sacks, 20 tackles-for-losses, six passes defenses and four forced fumbles.

He earned Second-team All-American (CNNSI), First-team All-Big 12 Conference, and Big Twelve Newcomer of the Year honors.

However, his season came to an early end after he tore the ACL in his left knee against Fresno State.

In 2006, he appeared in two preseason games for the Cardinals, however, he suffered an injury, and on September 5 was placed him on Injured Reserve.

[2] On January 25, 2007, Mitchell signed with the Orlando Predators of the Arena Football League.