The Chargers have signed 29-year old linebacker Dontarrious Thomas.  Thomas did not play in the NFL during the 2009 season.  He has played in 63 games in his NFL career and he has made 144 tackles, defensed 2 passes, has 1.5 sacks and he has forced 1 fumble.  The main job for Thomas during the playoffs will likely be on special teams for the Chargers.