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December 14, 2013 AT 9:39 AM
The 18-year-old gunman who wounded a fellow student at a Colorado school before taking his own life Friday was described as a bright, politically opinionated young man who had a beef with the school’s debate team instructor and librarian. Arapahoe County Sheriff Grayson Robinson identified the gunman as Karl Halverson Pierson, 18, a senior at Arapahoe High School in Centennial. Authorities said he entered the school about 12:33 p.m. local time, looking for a specific teacher with whom he'd had an earlier confrontation .