The Dolphins announced Monday that they have signed LB Marvin Mitchell.
Mitchell, 26, is a four-year NFL veteran. He had spent the previous four seasons (2007-10) with the Saints, who selected him in the seventh round of the 2007 draft.
The University of Tennessee product has played in 55 career NFL games, with two starts and was considered to be one of the Saints' top special-teams players. He has one sack and two forced fumbles in his career.