Columbine Killer's Mother Reflects on Her Son, What She Missed
This is her first television interview since the Columbine massacre 17 years ago
Healing After Columbine: Survivors, Victims' Families on Moving Forward
It's been 17 years since Dylan Klebold and Eric Harris attacked their school.
Experts' Tips on How to Talk to a Troubled Child
Experts who have studied mental health in children and Columbine offer advice.
Resources for Suicide Prevention, Mental Illness Concerns, Helping Parents Cope
Information about mental health organizations and other resources.
Thwarted School Shooter Says He Was 'Relieved' He Was Stopped
Russell Frantom was just 16 years old when he began talking online about a plan.
School Shootings Since Columbine: By the Numbers
A look at statistics of gun violence on school campuses nationwide.
Friend Recalls Moment She Turned in Alleged 'Road Rage' Killer
"The first words out of his mouth [were], 'I got them,'" Khatelyn Krisztian said
'Road Rage' Shooting Victim's Kids Regret What Happened
Tammy Meyers was shot and killed in her driveway on Valentine's Day 2015.
Abandoned 'Manger Baby' Reunites With Family 44 Years Later
DJ Williams was found abandoned in a church's nativity scene in 1971.
Woman Has Chance Encounter With Man She Believes Is Long-Lost Brother
Gina Lozada saw Chris at a casino before she told him they might be siblings.
Woman Searching for Father in Decades-Old Mystery
Amanda Holdiness was raised by a single mother, her grandmother and godparents.
Michigan Lawmakers Caught in Affair Cover-Up Speak Out
Todd Courser and Cindy Gamrat were both married with kids during their affair.
Inside Michigan State Representative's Secret Affair Cover-Up
Todd Courser and Cindy Gamrat had an extramarital affair while in office.
Daughters of Texas Murder-for-Hire Killer Discuss Dad's Involvement
Prosecutors claimed a Texas doctor hired David Shepard to kill another doctor.
Vargas Is the Co-anchor of '20/20' on ABC News
Weekend Anchor, "World News with David Muir" Co-Anchor, "20/20"
Watch: Sue Klebold Explains Why She's Coming Forward: Part 1
In her first television interview, Klebold wanted to share her journey in the aftermath of the Columbine massacre.
Watch: Sue Klebold Recalls What Her Son Dylan Was Like at Home: Part 2
Klebold said she had no idea her son, who she used to call her "Sunshine Boy," was depressed and secretly suicidal.
Watch: What Happened to Dylan Klebold Over Time: Part 3
Experts examine the differences between the two Columbine killers, Dylan Klebold and Eric Harris.
Watch: When Sue Klebold's Denial of Son's Involvement Ended: Part 4
Klebold said she thought Columbine was just a "moment of madness" until detectives showed her the boys' homemade videotapes.
Watch: Thwarted Shooters and Copycats After Columbine: Part 5
An FBI expert talks about the "epidemic" of school shootings and what everyone can do to help prevent them.
Watch: Columbine Victims, Survivors Remembered: Part 6
Those who were injured or lost loved ones in the tragedy have tried to move on and some have set up foundations.
Watch: Teen Shares Her Story of Battling Depression
'20/20' What's Your Story: Bailey said she was 15 years old when she attempted suicide and talks about how she got through...
Watch: School Shootings Since Columbine: By The Numbers
A look at the statistics of gun violence on school campuses nationwide.
Full Episode: 20/20 10/30/15: Troublemaker
Leah Remini Recalls When She First Got Involved in Scientology; Leah Remini on Being Friends Tom Cruise, His Wedding to Katie...
Full Episode: 2020 09/25/15: The O.J. Simpson Tapes
O.J. Simpson: Inside the Case of the Defense 'Dream Team'; Hear O.J. Simpson Speak For the First Time Under Oath
Full Episode: 20/20 09/04/15: Pope Francis and the People
Pope Francis Asks Chicago Teen to Sing for Him; Pope Francis Calls Los Angeles Mother a 'Brave Woman'; The pontiff was...
Full Episode: 20/20 06/19/15: 'The Wolfpack'
'Wolfpack' Brothers Grew Up Locked in NYC Apartment for Years; Chance Encounter With Filmmaker Changes 'Wolfpack' Brothers'...
Full Episode: Bruce Jenner - The Interview
Bruce Jenner shares an exclusive and wide-ranging conversation with Diane Sawyer.
Full Episode: 20/20 02/27/15: A Nation of Women Behind Bars: A Diane Sawyer Hidden America Special
Women Behind Bars and the Families They Left Behind; The Duel Between Inmates and Officers Over Prison Contraband; What Life...
Full Episode: 20/20 03/18/15: The Untold Story of 'The Sound of Music'
Fifty years after its release, Julie Andrews returns to Salzburg, Austria, with ABC News' Diane Sawyer.