Karl Pierson, the alleged shooter at the Arapahoe High School in suburban Denver who left 2 wounded and then took his own life. (via Facebook)

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Karl Pierson, the alleged shooter at the Arapahoe High School in suburban Denver who left 2 wounded and then took his own life.  (via Facebook)
Karl Pierson, the alleged shooter at the Arapahoe High School in suburban Denver who left 2 wounded and then took his own life.  (via Facebook)
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