The parents of Columbine shooter Dylan Klebold speak out in public for the first time since the 1999 massacre.
In an interview with a New York Times columnist, Tom and Susan Klebold say they'll never forgive themselves for missing the warning signs about their son's troubled mental state. It was also revealed Tom even offered to go to the school and negotiate with his son on the day of the shooting.
The Klebolds believe bullying may have set off their son.
Dylan Klebold and Eric Harris killed 13 people at Columbine High School five years ago before turning the guns on themselves.