In 1999, Mandy Cooke was a sophomore at Columbine High School in Littleton, Colorado. On April 20, two students opened fire at the school, killing 13 people and themselves.

After surviving that day, Mandy wanted to move on with her life — and she became a teacher. But the shooting had a lasting impact.

At StoryCorps in Denver, Mandy sat down with Paula Reed — her former teacher from Columbine – to talk about what came next.

Top photo: Paula Reed (L) and Mandy Cooke (R) at StoryCorps in Denver, CO. By Kevin Oliver for StoryCorps.