The Panthers have signed DT Darwin Walker.  Walker played in 11 games with the Bears last season and he compiled 17 tackles and had 1 sack.  Walker has now played in 98 games in his NFL career and he has compiled 189 tackles, defensed 14 passes, has 28.5 sacks, forced 5 fumbles and he has intercepted 1 pass.  This was a solid depth signing for the Panthers.