Rubin Carter, most recently a coach at Towson, is the Boilermakers' defensive line coach.

Carter coached the defensive line at Towson for one season and has previous experience in the NFL with the Redskins, the Jets and the Broncos as a D-line coach as well as several stops on the collegiate level, including as head coach at Florida A&M (2005-2007).

Carter played in the NFL for 12 seasons, including in two Super Bowls, with the Denver Broncos.

"I love what Coach Carter brings to Purdue," head coach Darrell Hazell said in a statement. "He is a 12-year NFL veteran with over 25 years of coaching experience on all different levels. ... He is a great man that our players will learn a tremendous amount from both on and off the field."

But just when Purdue appeared to have its staff completed, it apparently is left searching to fill a spot.

After just about one month on the job, offensive line coach Jim Bollman is leaving the Boilermakers, GoldandBlack.com has learned. Bollman is expected to move on for a second stint at Michigan State, perhaps as offensive coordinator as well as offensive line coach.

Bollman had signed a contract at Purdue and was scheduled to make $240,000. He has experience as an offensive coordinator, spending most of his nine seasons under Jim Tressel at Ohio State in that role.