Article continues below advertisementDallas Cowboys defensive end Marshawn Kneeland died at 24, leaving fans heartbroken and sparking questions about his sudden cause of death.Article continues below advertisementWhat Happened to Marshawn Kneeland? Source: MEGAMarshawn Kneeland was known for his football appearances with the Dallas Cowboys.The Dallas Cowboys organization confirmed the athlete's death in a statement on Thursday, November 6. "It is with extreme sadness that the Dallas Cowboys share that Marshawn Kneeland tragically passed away this morning," the team announced.