- "I wish I had known then what I know now," mother says
- Dylan Klebold and Eric Harris killed 13 people and injured 24 in the attack on Columbine High School
- This is her first television interview since the tragedy nearly 17 years ago
(CNN)Her son and his friend killed 13 people at Columbine High School almost 17 years ago. Sue Klebold has lived with guilt since -- guilt for what her son did and how she, a loving mother, raised a boy who became a mass murderer.