The Dallas Cowboys made a surprising and tragic announcement on Wednesday, breaking the news that 24-year-old defensive end Marshawn Kneeland had died. No cause of death has been announced yet. "It is with extreme sadness that the Dallas Cowboys share that Marshawn Kneeland tragically passed away this morning," the Dallas Cowboys said in a statement, as first shared by ESPN's Adam Schefter . "Marshawn was a beloved teammate and member of our organization. Our thoughts and prayers regarding