Article continues below advertisementDoug Martin, a two-time Pro Bowler who played for the Oakland Raiders and Tampa Bay Buccaneers, reportedly died in police custody, leaving sports fans curious with his cause of death.Article continues below advertisementWhen Did Doug Martin Die?Source: MEGADoug Martin's death was confirmed by his family on October 19.Martin's family confirmed his death in a statement on Sunday, October 19. "It is with great sadness to inform you all that Doug Martin passed away Saturday morning. Cause of death is currently unconfirmed.