Doug Martin died while in police custody after being arrested following a break-in to an Oakland home ... according to a new report.
The East Bay Times -- citing anonymous sources -- claims the former Tampa Bay Buccaneers running back was taken to a hospital, where he later died, after being contacted by Oakland Police ... who were responding to a reported home break-in early Saturday near the Oakland Zoo.
Oakland Police says officers were simultaneously told the suspected burglar was experiencing a medical emergency. A "brief struggle" followed, and the individual became unresponsive after taken into custody.