Warning: this interview contains disturbing material.

Columbine. The name of the school has come to symbolize a moment of mindless murder and overpowering sorrow. On April 20, 1999, two 17-year-old boys, Eric Harris and Dylan Klebold brought shotguns and automatic weapons to their school in Littleton, Colo.

At the end of their rampage, 15 people were dead: 12 students, one teacher and the two gunmen, by self-inflicted gunshots.

Loving someone is not enough to keep them safe if their thoughts are broken. - Sue Klebold

Dylan Klebold was 17 when he and another classmate killed 12 students and one teacher at Columbine High School, before taking their own lives, in 1999. (Courtesy of Sue Klebold) For the past 17 years, Sue Klebold, Dylan Klebold's mother, has lived with the grief and shame of what her son did on that horrific day. She has racked her mind to comprehend how the kind, young son she loved could carry out such a despicable crime.





Sue and Dylan Klebold, in a photo from Sue's book, A Mother's Reckoning: Living in the Aftermath of Tragedy. (Courtesy of Sue Klebold) And, she's finally began to talk about her journey in a new book, A Mother's Reckoning: Living in the Aftermath of Tragedy . Profits from the book will be donated to research and charitable organizations focusing on mental health issues.

This segment was produced by The Current's Howard Goldenthal.