The pain and sadness of a Columbine killer's mother - BBC News
The connection between mental illness, extremism and mass violence
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The Everlasting Contrast
Manson: Columbine massacre 'destroyed' career
Mass killing plot teen obsessed with Columbine killers and Anders Breivik jailed for 16 years - Daily Record
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Signaling for attention / The 16-year-old accused of killing Pamela Vitale made dramatic changes in his appearance. That could be a red flag, experts say.
Mental Health Association of Maryland - We look forward to hearing from Sue Klebold this evening! She's with MHAMD COO Teresa Fields. | Facebook
Why did the Columbine killers spare so many people in their school rampage? - Quora