After a classmate pulled out a gun in class, Kendrick Castillo couldn't just stay still. He died when he lunged at the shooter, giving other students at STEM School Highlands Ranch enough time to hide, his family and a classmate said. https://t.co/Qq42Dc8Wuh

After a classmate pulled out a gun in class, Kendrick Castillo couldn't just stay still. He died when he lunged at the shooter, giving other students at STEM School Highlands Ranch enough time to hide, his family and a classmate said. https://t.co/Qq42Dc8Wuh (via Twitter http://twitter.com/CNN/status/1126343815529414656)