Twenty-three years later, Frank DeAngelis vividly recalls the day his life changed forever. On April 20, 1999, he was the principal at Columbine High School in Littleton, Colorado, when two students carrying guns and bombs entered the school and opened fire.
The border city of Uvalde, Texas is mourning. Salvador Ramos, 18, shot and killed 19 fourth-grade students and two teachers at Robb Elementary School. They were all in one classroom.