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Tracing the Steps of Colorado High School Shooter

Details start to emerge about Karl Pierson and possible motivations for his attack.
12/15/2013

Transcript for Tracing the Steps of Colorado High School Shooter

This morning we get new information that is allowing us to retrace the footsteps of Carl Pearson. The high school senior opened fire inside -- school on Friday he had an arsenal that included a... See More
This transcript has been automatically generated and may not be 100% accurate.
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