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

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.

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.