December 30, 2013
Arapahoe County Sheriff Grayson Robinson gestures Monday during a news conference at which he and other officials discussed the investigation into the Dec. 13 shooting at Arapahoe High School in Centennial, Colo.
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The teenager who fatally shot a fellow student at his suburban Denver high school this month entered through a door that was supposed to be locked but had been propped open, the sheriff said Monday.
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