State and federal authorities believe his mother may
have once worked at the elementary school where Adam went on his deadly rampage, although she was not a teacher, according to relatives, perhaps a volunteer
Nancy and her husband Peter, Adam's father, divorced in 2009. When they first filed for divorce in 2008, a judge ordered that they participate in a "parenting education program."
Peter Lanza, who drove to northern New Jersey to talk to police and the FBI, is a vice president at GE Capital
and had been a partner at global accounting giant Ernst & Young.
Police had initially identified Ryan as the killer. Ryan sent out a series of Facebook posts saying it wasn't him and that he was at work all day. Video records as well as card swipes at Ernst & Young verified his statement that he had been at the office.
Investigators are looking into whether Adam Lanza was carrying his older brother Ryan's identification at the time of the shooting, which may have caused the confusion. Neither Adam nor Ryan has any known criminal history.