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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. Getty

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.

Paramedics provided aid before the person was taken to the hospital, where they later died, per OPD. Getty

Officers involved in the

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