NEWTOWN -- The man who authorities believe unleashed a bloody rampage at Sandy Hook Elementary School Friday was an honors student who was described a "socially awkward" youth.
Several sources have identified Adam Lanza as the 20-year-old man responsible for the deaths of 20 children and six adults at the school in a horrific scene that gripped the nation.
A woman who lives near the Lanza family said Lanza was a "reserved" and shy youth who appeared to be "troubled."
"His mother would always say how smart he was," said Beth Israel, who lives in the neighborhood and whose daughter was friends with Lanza while attending elementary school.
She added that Lanza, who was listed as receiving "high honors" while attending the ninth grade at Newtown High School in May 2007, may have had a developmental disability.
Lanza's parents, Nancy and Peter Lanza, were divorced in 2009 after 28 years of marriage due to "irreconcilable differences," according to court documents.
About nine months after Nancy Lanza filed for the divorce, the couple worked out an agreement that included joint custody of Adam Lanza, who was 17 at the time, although he was to live primarily with his mother, the records state.
The divorce filings indicated that Adam Lanza had lived in Sandy Hook since his birth.
A source told Hearst Connecticut Newspapers that Nancy Lanza was a substitute teacher at the elementary school, but was not at work on Friday when the shooting occurred.
The Associated Press reported that Nancy Lanza was found dead in her home.
State and local police blocked off the neighborhood surrounding a house in Newtown Friday on Yogananda Street that local property records state is owned by Nancy Lanza.
While State Police spokesman Lt. Paul Vance confirmed there was one fatality in a location other than the school, he declined to identify the victim.
Officials cited by The Associated Press said Adam Lanza drove to the school in his mother's car, and three guns were found at the scene.
Two handguns, a Glock and a Sig Sauer, were found inside the school, officials said, while a .223-caliber rifle was recovered from the back of a car in the school parking lot.
CNN, citing an unnamed law enforcement official, reported that Lanza entered the school building wearing "black battle fatigues and a military vest."
Originally, sources had identified the shooter as Ryan Lanza, 24, Adam Lanza's older brother who lives in Hoboken, N.J.
According to reports with NorthJersey.com, police surrounded a Hoboken apartment on Friday afternoon where the alleged shooter's older brother lived before taking him into custody for questioning.
Ryan Lanza has a Facebook page that posted updates Friday afternoon that read "it wasn't me" and "I was at work."
Peter Lanza, a vice president of taxes for GE Energy Financial Services, declined to answer questions from reporters in front of his home in Stamford in the Westover section of the city.
Lanza has worked as tax specialist and had served as an adjunct professor at Northeastern University in Boston since 1995.
A neighbor said Peter Lanza had recently remarried.
According to court documents, Peter Lanza was required to send significant alimony payments to Nancy Lanza, including monthly payments of $10,000 a month and increasing to a minimum of $12,450 up until 2023.
The court documents list Peter Lanza's gross weekly income as $8,556 and that he was required to pay all of Adam Lanza's college and graduate school expenses.
It wasn't immediately clear, however, if Lanza was attending college at the time of the shooting.
Peter and Nancy Champion Lanza were married in 1981 in Kingston, N.H.
According to a report Friday on the website of the Tampa Bay Times, Nancy Lanza's mother has a winter home in Brookville, Fla.
In the article, she acknowledged to a reporter over the phone that Adam and his brother Ryan are her grandchildren. Her Facebook page links to two sons, Jack and James Champion.
James Champion, who lives in Kingston, N.H., where the Lanzas were married, is identified as a police officer. The Union Leader reported that he was "too distraught to comment" when reached by one of its reporters and that media arriving at his home were turned away by police.
Some of the early descriptions of Lanza are eerily similar to the two teenagers responsible for killing 13 people in April 1999, at Columbine High School in Colorado. Both Eric David Harris and Dylan Bennet Klebold, who also took their lives after the shooting rampage, were described as social outcasts who were troubled students and often the victims of bullies.
Harris and Klebold entered the Colorado school wearing black overcoats and were heavily armed in what was at the time the deadliest school shooting in the country's history.
The shooter in the April 2007 Virginia Tech killings that claimed 32 lives, Seung-Hui Cho, was found in an independent review after the slayings to have shown signs of depression and isolation and occasional instances of aberrant behavior at the university.
email@example.com; 203-731-3358; www.twitter.com/DirkPerrefort