Authorities in Newtown, Conn. Are trying to learn everything they can about Adam Lanza in an effort to figure out what set him on a path leading to the massacre of 26 children and adults at an elementary school.
Police, so far, have shed no light on a possible motive for the nation's second-deadliest school shooting.
The 20-year-old gunman, who also killed his mother and himself, was described by some as brilliant but remote. An official who spoke on condition of anonymity said it was not clear that Lanza had a job.
A law enforcement official who was briefed on the investigation says Lanza is believed to have suffered from a personality disorder and lived with his mother in a well-to-do part of prosperous Newtown, about 60 miles northeast of New York City. Neighbors are doctors or hold white-collar positions. Lanza's parents filed for divorce in 2008.