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December 15, 2013 AT 5:12 AM
The 18-year-old gunman who wounded a fellow student before taking his own life at a Colorado high school committed suicide less than a minute and a half after he entered the building, armed with a shotgun and multiple rounds of ammunition that he purchased legally, authorities said Saturday. Speaking at a press conference, Arapahoe County Sheriff Grayson Robinson said student gunman Karl Halverson Pierson, 18, a senior at Arapahoe High School in Centennial, Colo., purchased the pump-action shotgun used in the shooting incident legally on Dec. 6 at a local retail outlet, then legally purchased multiple rounds of shotgun ammunition on Friday morning