Sue Klebold’s 17-year-old son partnered with 18-year-old Eric Harris to kill 13 people before taking his own life at the Colorado school 17 years ago. In her first TV interview aired Friday evening, Sue Klebold discusses with Diane Sawyer on 20/20 how she has lived with guilt for what her son did and how she, a loving mother, raised a boy who became a mass murderer.