The 20-year-old may have suffered from a personality disorder, law enforcement officials said. Investigators were trying to learn as much as possible about Lanza and questioned his older brother, who is not believed to have any involvement in the rampage.
Lanza shot his mother at their home before driving her car to Sandy Hook Elementary School and — armed with at least two handguns — carried out the massacre, officials said. A third weapon, a .223-caliber rifle, was found in the car, and more guns were recovered during the investigation.
So far, authorities have not spoken publicly of any possible motive. They found no note or manifesto, and Lanza had no criminal history. Witnesses said the shooter didn’t utter a word.
Lanza’s aunt said her nephew was raised by kind, nurturing parents who would not have hesitated to seek mental help for him if he needed it.
Marsha Lanza, of Crystal Lake, Ill., said she was close with Adam Lanza’s mother and sent her a Facebook message Friday morning asking how she was doing. Nancy Lanza never responded.
Marsha Lanza described Nancy Lanza as a good mother and kind-hearted. If her son had needed counseling, “Nancy wasn’t one to deny reality,” she told The Associated Press late Friday.