LAS VEGAS—Former Raiders wide receiver Henry Ruggs III was driving at 156 mph with a blood-alcohol content twice Nevada’s legal limit before his sports car slammed into the rear of a vehicle that burned, killing a 23-year-old woman, prosecutors said Wednesday. The Raiders released Ruggs late Tuesday, just hours after the crash and shortly after he was released from a hospital and booked into a Las Vegas jail. The 22-year-old former first-round NFL draft pick remained seated in a wheelchair with a foam brace on his neck and jail guards at his elbows during his initial court appearance Wednesday on pending felony charges of driving under the influence of alcohol resulting in death and reckless driving. The extent of his injuries was not disclosed, although Clark County District Attorney Steve Wolfson said outside court that he believed Ruggs suffered a leg injury. Ruggs’s girlfriend, identified by police as Kiara Je’nai …