Former Tampa Bay Buccaneers and Oakland Raiders star running back Doug Martin has died, his family said in a statement on Sunday. He was 36.

The condition, which can cause erratic behavior and severe mental illness, is associated with repeated head trauma and has been found in hundreds of former NFL players in recent years.

Former Oakland Raider Doug Martin died over the weekend while in Oakland police custody, authorities said. Velena Jones reports. Former Oakland Raider Doug Martin died over the weekend while in Oakland police custody, authorities said.