Silence Broken: A Mother's Reckoning

Sue Klebold, the mother of Columbine gunman Dylan Klebold, discusses her relationship with her son, what happened inside her home leading up to the tragedy, and the victims of the April 20, 1999, massacre. In addition, Diane Sawyer examines teenage mental health, warning signs of a child in crisis, and what can be done to prevent the next school shooting.