The twisted Texas school gunman who massacred 19 children and two adults callously barricaded them in their classroom, leaving them unable to escape.
Salvador Ramos then opened fire with an AR-15 he legally bought on his 18th birthday, systematically killing each one.
As he took the children at the Robb Elementary School in Ulvadle hostage, one heroic 10-year-old bravely tried to save her classmates as she tried calling 911 for help.
