The Bears have signed Thomas, Omar Kelly of South Florida Sun-Sentinel reports. While Matt Forte is clearly atop the Bears' running back depth chart, Thomas joins the team's complementary/backup mix, a group that also includes Jacquizz Rodgers, Ka'Deem Carey, Jeremy Langford and Senorise Perry. Thomas, who was made a second-round draft choice by the Dolphins in 2011, carried the ball 44 times for 168 yards and two TDs in 12 games for Miami this past season. Now that he's part of the Chicago backfield equation, he's still a break or two away from fantasy consideration.