UPDATE: Arapahoe County Sheriff Grayson Robinson on Friday night identified the 18-year-old shooter as Karl Halverson Pierson. The sheriff said Pierson made no attempt to hide his weapon after entering the school from a parking lot and asking for a teacher by name. Robinson did not elaborate on any possible motive except to say Pierson had had a "confrontation or disagreement" with the teacher.
UPDATE: Sheriff: Colorado school shooter wounds teen, kills self
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