JEFFREY BROWN:

April 20, 1999, Columbine High School in Littleton, Colorado.

Two seniors, Eric Harris and Dylan Klebold, walked into the school armed with weapons and homemade bombs. Less than an hour later, 12 students and one teacher were dead, 24 students injured, and the two shooters had turned the guns on themselves.

It was a searing time for the community, for the victims' families, and for the nation.

Seventeen years later, Sue Klebold, the mother of Dylan, writes of a son she thought she knew, the parent she thought she was, a tragedy and its aftermath. Her new book is, "A Mother's Reckoning."

Sue Klebold joins us now from Denver.

Sue Klebold, welcome to you.

You write early in this book: "The ordinariness of our lives before Columbine will perhaps be the hardest thing for people to understand about my story. For me, it is also the most important."

Why is that the most important thing?

SUE KLEBOLD, Author, "A Mother's Reckoning": Because I want people to understand that, if someone is struggling with thoughts of suicide or, in some cases, homicide, that these issues can be hidden.

And we should all try to be more mindful of what our loved ones are thinking, what might be hidden behind their expressions, and how their behaviors can lie if they're very sophisticated at hiding what they're thinking and feeling.

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