Peterson, an eighth-year defensive lineman who joined the club as a free agent on Nov. 13, 2007, totaled 94 tackles (60 solo), including five sacks, in 42 games (15 starts) with the Broncos. His signature play in 2009 was a sack of Ben Roethlisberger. He forced a fumble on the play, which was recovered by and returned 54 yards for a touchdown.
Peterson went to the same high school as Broncos HC Josh McDaniels, Canton McKinley. Peterson attended Ohio State and was a former 3rd Round pick of the Green Bay Packers.
Erickson was signed before the 2008 season as a college free agent and spent the past two seasons on the team's practice squad.