(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.
She has spoken only a few times to the media in the past, but has never appeared on television. Her first TV interview, given to ABC’s Diane Sawyer, airs Friday at 10 p.m. ET.
In it she talks about what life has been like after April 20, 1999, when her son, Dylan Klebold, and schoolmate Eric Harris committed what is the deadliest high school shooting in U.S. history. Clad in black trenchcoats and wielding four guns, the pair worked their way through the school after their plan to blow up hundreds of classmates failed.
Images of terrified students being led from the school with their hands on their heads became ingrained in national memory.
Sue Klebold never thought her son would do anything so horrific.
“I had all those illusions that everything was OK because, and more than anything else, because my love for him was so strong,” she says in the interview, according to a snippet released Thursday.
When her discussion with Sawyer turns to how many other parents insist they would have seen warning signs and been able to prevent the shootings, she says, “Before Columbine happened I would have been one of those parents.”
In a 2009 essay for O magazine, Klebold wrote that her son had a fun childhood but when he became a teenager things changed. She just didn’t think the worst, though. She wrote in O that she thought her maternal instincts would keep him safe. She would know if there was trouble.
She tells Sawyer that one of the things that has haunted her has been the thoughts she has almost every day about the children and the teacher who needlessly died.
“I just remember sitting there and reading about them,” she says while holding back tears, “… all these kids and the teacher. … and I keep thinking, (have) constantly thought, how I would feel if it were the other way around and one of their children had shot mine. I would feel exactly the way they did. I know I would. I know I would.”
She has said previously that she and her husband don’t understand why their son took part in the massacre.
Klebold hopes her story, which she tells in a book to be released next week, will help other parents spot potential signs of trouble with their children.
Dylan Klebold was 17 when he and Harris,18, carried out their long-planned attack on the high school about 13 miles south of downtown Denver. After 49 minutes in which they killed 13 and injured 24 others, they each committed suicide. The death toll could have been much, much worse; homemade propane bombs left in a cafeteria where hundreds of students were eating lunch failed to go off. Neither did bombs planted in their cars that were designed to kill people who responded to the scene.
“I wish I had known then what I know now: that it was possible for everything to seem fine with him when it was not, and that behaviors I mistook as normal for a moody teenager were actually subtle signs of psychological deterioration,” Sue Klebold wrote on the website for her book.
It echoes what she wrote in the O essay: “In raising Dylan, I taught him how to protect himself from a host of dangers: lightning, snake bites, head injuries, skin cancer, smoking, drinking, sexually transmitted diseases, drug addiction, reckless driving, even carbon monoxide poisoning. It never occurred to me that the gravest danger — to him and, as it turned out, to so many others — might come from within. Most of us do not see suicidal thinking as the health threat that it is. We are not trained to identify it in others, to help others appropriately, or to respond in a healthy way if we have these feelings ourselves.”
Klebold will donate the profits from her book to charities devoted to mental health issues, her publisher said.