The first photos of Adam Lanza have been released, along with more information on the 20-year-old responsible for the Connecticut school shooting massacre yesterday.
The Newtown, Conn., native was a child of the suburbs and of divorce who still lived with his mother, Nancy, in the quiet town about an hour from N.Y. City.
Friday, he began his day by shooting Nancy in the face.
As if that weren't disturbing and tragic enough, he then drove her car to nearby Sandy Hook Elementary School, armed with two handguns and a semi-automatic rifle.
There, before turning his gun on himself, he shot and killed 20 children. Six adults were also killed at the school. Nancy Lanza was found dead in her home.
A relative told ABC News that Adam was "obviously not well."
Family friends in Newtown described the young man as troubled and described Nancy as rigid. "[Adam] was not connected with the other kids," said one.
"A little bit different ... Kind of repressed."
Federal authorities believe his mother may have once worked where the Connecticut school shooting occurred, although she was not a teacher, as originally reported.
Nancy and her husband Peter, Adam's father, divorced in 2009.
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 accounting giant Ernst & Young.
Adam's older brother Ryan Lanza, 24, has worked at Ernst & Young for four years, following in his father's footsteps and carving out a solid niche in the tax practice.
He too was interviewed by the FBI, but neither he nor his father is under any suspicion, despite erroneous reports originally naming Ryan Lanza as the killer.
"[Ryan] is a tax guy and he is clean as a whistle," a source familiar with him said.
Ryan Lanza (above, right) sent out a series of Facebook posts saying it wasn't him and that he was at work all day. Video records and card swipes at Ernst & Young confirm that.
Two federal sources say that an ID belonging to Ryan Lanza was found at the scene of the mass shooting, perhaps leading to the initial conclusion.
Neither Adam Lanza (above, left) nor Ryan has any known criminal history.
Sig Sauer and Glock handguns were used in the slaying, and .223 shell casings - a round used in a semi-automatic military-style rifle - were also found at the scene.
Nancy Lanza had numerous weapons registered to her, including a Glock and a Sig Sauer, plus a semi-automatic Bushmaster rifle, which holds .223 caliber rounds.
Friends and relatives of the Lanzas in New Jersey, Connecticut, Massachusetts are being interviewed by the FBI in an effort to put together a better picture of the gunman.
"I think the most important thing to point out with this kind of individual is that he did not snap this morning and decide to act out violently," said FBI profiler Mary Ellen O'Toole
"These acts involve planning and thoughtfulness and strategizing in order to put the plan together so what may appear to be snap behavior is not that at all.
President Obama cried during a press conference when describing the "beautiful little kids" between five and 10 years of age who had been slain.