Colo. high school shooter top debater with excellent grades
1,056 views · Published 15 December 2013 · 2:01 · Indexed 20 October 2026
Channel: CBS Evening News · 2013 · News & Politics
Investigators are looking into what caused 18-year-old Karl Halverson Pierson to open fire at his high school, killing himself and injuring a fellow student. Classmates who knew Pierson say he was outgoing with good friends and had excellent grades. Barry Petersen reports.
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