The Patriots signed free-agent LB Bobby Carpenter on Thursday. Terms of the deal were not announced.
Carpenter has been in the NFL since 2006, when he was a first-round pick of the Cowboys. He played in Dallas until 2009 and was with the Dolphins in 2010 before being cut and signed by the Lions.
Last season, Carpenter played in all 16 games, with three starts, for Detroit and recorded 29 tackles and an interception, which he returned 34 yards for a score.