Pedro Oregon Navarro, a 23-year-old father of two, was inside his apartment last month when several Houston police officers burst in, looking for illegal drugs.

After the Mexican immigrant locked himself inside his bedroom, the police kicked in the door and, suspecting Oregon had shot at them, began firing.Thirty-three bullets later, Oregon was dead, shot a dozen times, including nine times in the back.

But police found no drugs, and an investigation would show the officers had no warrant and incorrectly relied on a tip from an informant not registered with the department. A gun that officers said Oregon had pointed at them was never fired.