Nelson finished the 2011 season as OU's second-leading tackler with 102, the fifth-best one-season total ever by an Sooner defensive back.
He also had two interceptions and two forced fumbles.
It was a breakout season for Nelson, who started all 14 games.
His tackle total nearly doubled the number he accumulated through his first three seasons combined.
The Sooners finished the season with a 12-2 mark and won both the Big 12 Championship and the Fiesta Bowl.