Chilling Details Emerge on Newtown School Shooter Adam Lanza

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Chilling Details Emerge on Newtown School Shooter Adam Lanza

Chilling Details Emerge on Newtown School Shooter Adam Lanza
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Chilling Details Emerge on Newtown School Shooter Adam Lanza

by ABC News Videos

Authorities learn more about 20-year-old gunman, how quick his massacre was.

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