December 14, 2012
Newtown, Conn. Adam Lanza, 20, killed 20 children and six others at the Sandy Hook Elementary School. He killed his mother, Nancy, at her home prior to the massacre at the school. Lanza committed suicide after the rampage. The shooting was the second deadliest in U.S. history, behind the 2007 shooting at Virginia Polytechnic Institute that claimed 32 people.
See also Milestones in Federal Gun Control