Whiteside was selected by the Indianapolis Colts in the fifth round, with the 162nd overall pick, of the 2003 NFL draft.[3] He played two seasons for the Colts.[4] He officially signed with the team on July 24, 2003. He was waived on August 31, 2003.[5]
Whiteside was claimed off waivers by the Cincinnati Bengals on September 1, 2003.[6] He was waived by the Bengals on October 22, 2003.[5]
Whiteside was signed to the practice squad of the Colts on October 27, 2003.[5] He was promoted to the active roster on November 19 and played in five games for the Colts during the 2003 season, recording one solo tackle and one assisted tackle.[5] Whiteside appeared in seven games for the Colts in 2004, totaling two solo tackles.[5] He was placed on injured reserve on November 11, 2004.[5] He was placed on the physically unable to perform list on June 14, 2005.[5] Whiteside was waived by the Colts on July 28, 2006.[5]