Figured it might be time to start this.
Dallas LB Sean Lee has apparently torn his ACL. Per Rotoworld:
The Dallas Morning News reports the Cowboys believe ILB Sean Lee has a torn ACL.
That's what has been widely speculated, but the Cowboys won't know for sure until they get back Lee's MRI. Lee got his left knee hung up before getting pancaked by first-round OG Zack Martin in a "non-contact" drill. Among his many, many other injuries, Lee tore his right ACL at Penn State.
That's a huge blow for the Cowboys, if he did tear his ACL. Lee is a quality LB and recently got a pretty big deal, but the guy just can't catch a break.