It's been a tough year already for linebackers
First, it was Brian Cushing. Then, Ray Lewis.
And, now, Dallas Cowboys linebacker Sean Lee and Carolina Panthers linebacker Jon Beason are done for the season.
The Cowboys placed Lee, an emerging young standout, on injured reserve with torn ligaments in his toe that will require surgery next week.
Former Detroit Lions first-round linebacker Ernie Sims was signed to the roster to replace Lee. Safety Charlie Peprah was added as well with punter Chris Jones heading to injured reserve.
Lee is the Cowboys' leading tackler and defenisve leader.
Sims was with the Indianapolis Colts last season, and tried...