As a sophomore, he played in 2 games, one at defensive end and the second at offensive tackle, after being switched in the middle of the season.
As a junior he was moved back to defensive end, posting 27 tackles (2 for loss), 2 sacks and 10 quarterback pressures.
As a senior, he was already playing with a cast for a broken arm he suffered in preseason,[1] when he had a torn Achilles tendon in the third game against Texas A&M University, collecting 5 tackles (one for loss) and one sack.
Jamison was signed as an undrafted free agent by the St. Louis Rams after the 2005 NFL draft on April 25, dropping because of his injury history.
On December 31, he was promoted to the active roster and was declared inactive for the final game, following an injury to linebacker Kevin Burnett.