Carnell Lamar "Cadillac" Williams (born April 21, 1982) is an American football coach and former running back in the National Football League. Williams was the interim head coach of the Auburn Tigers, the first African American to hold the position in Auburn history. He played college football at Auburn. During the 2005 NFL Draft, Williams was drafted by the Tampa Bay Buccaneers in the first round and also played for the St. Louis Rams. In 2005, Williams won the NFL Offensive Rookie of the Year award.