Adam Lanza, the 20 year old who killed 20 children and six adults at Sandy Hook Elementary School in Connecticut on Friday, has been described as a troubled loner, who did not have a Facebook or Twitter account, and who was socially awkward.
A family friend, Barbara Frey, has told ABC News: "[Adam] was not connected with the other kids...[he was] obviously not well."
It has now emerged that Lanza shot his own mother in the face, killing her, at their home in Newtown, before driving to Sandy Hook Elementary School dressed in back combat gear.
Reports are now saying that within seconds of arriving at the school Lanza began shooting, and within minutes he had shot 20 children aged between five and 10 years old, as well as six adults. All victims are reported to have been shot multiple times by Lanza.
The massacre came to an end when Lanza turned the gun on himself, shooting himself dead in an apparent suicide.
Police have confirmed that by the time they arrived they did not need to fire any gunshots, and as they conducted a room by room search of the entire school, they found Lanza dead in one of the classrooms, as well as multiple weapons at the scene.
Among the weapons were two semi-automatic weapons, which were both legally registered in his mother's name. A third rifle was found in the car outside.
Meanwhile, as it became clear that Adam Lanza was the young man behind the shootings, local residents who knew him began talking about what they knew about him on social media sites.
On Twitter one neighbor, who alleges they were a former classmate of Lanza, tweeted, "Adam Lanza has been a weird kid since we were five years old. As horrible as this was, I can't say I am surprised."
According to ABC News another former classmate emerged to tell them, "[Adam Lanza] was always very nervous and socially awkward.
The former classmate aded that "he didn't really want to be spoken to" and that "it appeared physically difficult for him to speak."
Other reports have also indicated how shy Lanza was, and in his seventh grade yearbook his photo was missing, with him being allowed to avoid the photo, instead being labeled "Camera Shy."
Not much else is apparent about the young man, apart from comments from those who knew him. He had no social media accounts on Facebook or Twitter, and avoided showing himself to people.
It is known that his parents divorced when he was 17 years old, and he continued to live in Newtown with his mother, where as his father moved to Stamford, Connecticut and remarried.
Court records have also shown that when Lanza's parents divorced, a judge had ordered them to participate in a "parenting education program."
In the aftermath of the shooting Adam Lanza's brother, Ryan Lanza, 24, was initially reported to have been the shooter. However, those initial reports turned out to be false, with police officials stating that they had found Ryan's ID at the scene of the shootings, and that had led to confusion as to who the dead killer was.