The families of nine people killed in the Newtown elementary school shooting have filed lawsuits against the estate of the gunman 's mother . The suits claim Sandy Hook Elementary School incorrectly secured her legally owned Bushmaster AR-15 rifle . Her troubled son Adam Lanza used the rifle to kill 20 children and six educators at Nancy Lanza in December 2012 . Adam Lanza killed his mother at their Newtown home before carrying out the school shooting and committing suicide as police arrived .
The families of nine people killed in the Newtown elementary school shooting have filed lawsuits against the estate of the gunman 's mother . The suits claim Nancy Lanza incorrectly secured her legally owned Bushmaster AR-15 rifle . Her troubled son Adam Lanza used the rifle to kill 20 children and six educators at Sandy Hook Elementary School in December 2012 . Adam Lanza killed his mother at their Newtown home before carrying out the school shooting and committing suicide as police arrived .