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Showing Original Post only (View all)Colorado School Shooter Legally Purchased 12-Gauge Shotgun [View all]
The teenage student police say opened fire at his Colorado high school legally purchased a 12-gauge shotgun at a Denver-area gun store within one week before Friday's attack, according to multiple law enforcement sources.
Karl Halversen Pierson, 18, barged into Arapahoe High School in Centennial with a shotgun on Friday, set off an explosive device, shot one student in the head, then killed himself. He was seeking "revenge" on the school's debate team instructor, Tracy Murphy, according to police.
Pierson had asked students where to find Murphy, according to police.
"The kid went after him specifically," the school's custodian Fabian Llerenas said. "He wanted to kill him."
Llerenas said he saw Halversen enter the building carrying a shotgun slung over his shoulder.
http://abcnews.go.com/US/colorado-school-shooter-legally-purchased-12-gauge-shotgun/story?id=21218890&singlePage=true