The Dallas Cowboys fear star linebacker Sean Lee tore his left ACL during the team's first organized team activity workout Tuesday, a source familiar with the injury told ESPN. Lee will undergo an MRI on Tuesday to see if the Cowboys' fears are a reality, the source said. Lee tore his right ACL in April 2008 while at Penn State, then partially tore his left ACL during the 2009 season. Read more http://espn.go.com/dallas/nfl/story/_/id/10990605/sean-lee-dallas-cowboys-injured-otas