Columbine High School seniors Eric Harris, left, and Dylan Klebold killed 12 students and one teacher, as well as injuring 24 others, in one of the largest school shootings of all time April 20, 1999. Psychiatrists have concluded that Harris demonstrated psychopathic behavior and Klebold was a depressive. At least two books published on the 10th anniversary of the tragedy contend that neither were bullied, rather they were bullies who carefully planned the massacre at least a year before the attack.
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