Her son was her killer

Nancy Lanza loves guns. Often she goes to one of the shooting ranges in the suburbs of North east of New York city along with her children. She often used to talk about her Gun collection.
At that time she was not aware that one day she will be killed by her own son with the a gun from her prized gun collection.
That was Adam Lanza who had carried out one of the worst massacre in a Connecticut school killing 26 children recently. Later he shot himself.