Patriots add LB depth with Bobby Carpenter

The New England Patriots made another quiet free-agent signing Thursday when the team added veteran linebacker Bobby Carpenter. The former first-round pick of the Dallas Cowboys has underachieved during his career.

Carpenter can help the Patriots most with depth. New England's 31st-ranked defense was thin last year behind starters Jerod Mayo, Brandon Spikes and Rob Ninkovich. Carpenter has experience playing in 3-4 and 4-3 defenses.

Carpenter, who was taken No. 18 overall in 2006, spent four seasons with the Cowboys and bounced around the past two years with the Miami Dolphins and Detroit Lions. Carpenter has 10 career starts, totaling 165 tackles, 3.5 sacks and one interception.

Last season Carpenter started three games for Detroit and recorded 29 tackles and an interception.