Kendrick Castillo – only days from high school graduation – acted fast inside of his British literature class at a suburban Denver school Tuesday afternoon. And he paid with his life. When a gunman burst through the door at STEM School Highlands Ranch, barking at students to stay in place and not move, Castillo, 18, rushed the shooter. It was a quick-thinking move that fellow students said gave them a chance to bolt for safety or take cover under desks. Another student said "Kendrick lunged at (the gunman), and he shot Kendrick, giving all of us enough time to get underneath our desks, to get ourselves safe, and to run across the room to escape.” His Dad, John Castillo said "I know that because of what he did, others are alive, and I thank God for that. I love him. And he is a hero and he always will be. He just loved people that much."