The Bills have signed linebacker Kawika Mitchell to a 5-year, $17.5 million dollar contract.  Mitchell played in 16 games last season for the Giants and he made 76 tackles, defensed 4 passes, made 3.5 sacks, forced 2 fumbles and intercepted a pass that he returned 20 yards for a TD.  Mitchell has now played in 75 games in his NFL career and he has made 380 tackles, defensed 22 passes, has 8 sacks, forced 3 fumbles and intercepted 4 passes one of which he returned for a TD.  This was a good move for the Bills who needed help at linebacker.