We now know that 20-year-old Adam Lanza entered a Newtown, Conn., elementary school and killed more than 20 children and six adults — after killing his own mother at home — on Friday, Dec. 14, 2012. It is arguably the worst mass school shooting in U.S. history.
There have been multiple inexplicable and shocking gun-related massacres in the United States in 2012, and it has fueled an impassioned and sometimes vicious debate between ardent gun-control proponents against gun rights advocates.
Here are the other mass murders of 2012.
