- Killed twelve students and one teacher with Eric Harris at Columbine High School.
- He had a history of losing his temper and cursing at teachers as well as getting into fights with his boss.
- He worked at a pizza restaurant.
- Attended his high school prom with his female friend Robyn Anderson three days before his massacre.
- He claimed to be suicidal and it's believed he had always intended to die in the massacre, either by his own hand or in a shootout with police.
- Son of author Sue Klebold.
- Son of a geophysicist and a special education worker.
- Had two cats named Rocky and Lucy and a bird.
- Had an older brother called Byron
- Brooks Brown was his childhood friend since elementary school.
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