NEW: Dallas Cowboys defensive end Marshawn Kneeland has passed away at the age of 24. His passing came just days after he scored a touchdown off a blocked punt against the Arizona Cardinals. “It is with extreme sadness that the Dallas Cowboys share that Marshawn Kneeland tragically passed away this morning,” the Cowboys said in a statement. “Marshawn was a beloved teammate and member of our organization. Our thoughts and prayers regarding Marshawn are with his girlfriend Catalina and his family.”