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Arapahoe teen on school shooter: ‘He was a completely normal student’

Dec. 14, 2013 at 9:55 AM ET

Video: Delaney Mullins, Addie Finch and Harrison Finch describe the frightening scene they saw inside Arapahoe high school during the shooting and what they knew about the 18-year-old gunman Karl Pierson.

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