The Bears agreed to terms with linebacker Blake Costanzo on a two-year contract. Costanzo has appeared in 61 games in five NFL seasons with the Bills (2007-08), Browns (2009-10) and 49ers (2011) registering 71 special teams stops with four forced fumbles and four fumble recoveries. The linebacker was second on the 49ers with 17 special teams tackles in 2011 and paced the team with four special teams stops in the playoffs adding a forced fumble and fumble recovery.