It's been 24 years since the unimaginable tragedy that took place at Columbine High School in Colorado — one of the deadliest mass shootings at a high school in U.S. history. Thirteen people were killed and 21 were wounded at the hands of two students.

Craig Scott is a survivor of the Columbine High School shooting. He was in the library, where ten students were killed, including two of his friends that had hidden next to him under a table. Craig escaped only to learn his sister, Rachel Joy Scott, was the first person killed.

For more than 20 years, Craig has dedicated his life to making a difference in schools. In speaking with more than a million people, Craig has positively impacted school cultures by sharing lessons learned from Columbine and challenging students to value themselves and others.

Today, Craig joins us to recall details of that terrifying day, his journey of healing and what we can do as a community to prevent another tragedy like Columbine from happening again.