description of the shooter
"Adam Lanza has been a weird kid since we were five years old," wrote aneighbor and former classmate Timothy Dalton on Twitter. "As horrible as this was, I can't say I am surprised."
In school, Lanza carried a black briefcase and spoke little. Every day, he wore a sort of uniform: khakis and a shirt buttoned up to the neck, with pens lined up in his shirt pocket.
A former classmate in his 10th grade honors English class, Olivia DeVivo, says he "was always very nervous and socially awkward."
She told ABC News that "he didn't really want to be spoken to" and that when teachers would call on him "it appeared physically difficult for him to speak."
Lanza avoided public attention and had few, if any, friends. He liked to sit near the door of the classroom to make a quick exit.
He even managed to avoid having his picture in his high school yearbook. Instead of his portrait, the space reserved for Adam Lanza says "Camera Shy." And unlike most in his age group, he seems to have left little imprint on the internet – no Facebook page, no Twitter account.