New surveillance video reveal alleged shooter, Jared Lee Loughner’s movements minutes before the Tucson massacre. After shooting Gabrielle Giffords, the shooter hits her aide. Judge John Roll shielded wounded Congressional aide Ron Barber behind a table. Video shows Loughner bending down to shoot Roll in the back.

loughner next fires on the crowd. the gunman turns to his right, shoots john barber, judge roll pushes barber to the ground and crawls on top of them. the two take cover under a table. then the gunman shoots rolle in the back. barber, who works for giffords survived. roll, a federal judge was dead at the scene.