On Dec. 14, 2012, a 20-year-old man walked into Sandy Hook Elementary School in Newtown, Conn., and killed 26 people.
Adam Lanza fatally shot 20 first-graders who were 6 and 7 years old and six adults. Before going to the school, Lanza shot and killed his mother. He killed himself as first responders were arriving at the school. (Video by Deb Kiner/PennLive.com)
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