Bryan McAllister’s personal reference notebook
September 12, 2026Short & citedBlog
Civic Viewpoint.
A quiet encyclopedia with a personal desk
Kept by Bryan McAllister — short guides, clear facts, and the Canadian angle when it matters.
Civic Brief • Mass Shooting

Adam Lanza

Adam Lanza was an American mass murderer who carried out the Sandy Hook Elementary School shooting in Newtown, Connecticut, on 14 December 2012.

Updated September 12, 20261 min readCited sources

Adam Lanza was an American mass murderer who carried out the Sandy Hook Elementary School shooting on 14 December 2012. The attack killed 20 children and 6 adults before Lanza died by suicide.

Background

Adam Lanza was born in 1992 in Kingston, New Hampshire, and lived in Newtown, Connecticut. Public reporting describes him as a reclusive young man, though many details of his private life remain disputed or incomplete.

Sandy Hook Elementary School shooting

On 14 December 2012, Lanza killed his mother, Nancy Lanza, at their home. He then attacked Sandy Hook Elementary School, where he killed 20 children and 6 adult staff members. He died by suicide as law enforcement arrived.

Aftermath and investigation

The massacre prompted extensive law-enforcement investigation and sustained public debate about firearms, school safety, and mental health. Official reports said he acted alone and did not establish a single definitive motive.

In short

  • Adam Lanza was the perpetrator of the Sandy Hook Elementary School shooting.
  • He killed his mother before the school attack.
  • 20 children and 6 adults were killed at the school.
  • Lanza died by suicide at the scene.
Canadian angle

The Sandy Hook shooting drew major media coverage in Canada and influenced Canadian discussions about school safety, gun violence, and public policy.

Quick questions

Who was Adam Lanza?
Adam Lanza was the perpetrator of the Sandy Hook Elementary School shooting in Newtown, Connecticut, in 2012.
What happened at Sandy Hook?
Lanza killed 20 children and 6 adult staff members at the school after killing his mother earlier the same day.
Did Adam Lanza die at the scene?
Yes. He died by suicide at the school as law enforcement arrived.

Sources

  1. Encyclopaedia Britannica — https://www.britannica.com/biography/Adam-Lanza
    Supports: Biographical identification, date of death, and description of the Sandy Hook attack.
  2. CNN — https://www.cnn.com/us/connecticut-shootings-fast-facts
    Supports: Basic biographical facts and the sequence of events on 14 December 2012.
  3. BBC News — https://www.bbc.com/news/world-us-canada-25097127
    Supports: Official-report findings on his interest in Columbine and the lack of a confirmed motive.
  4. BBC News — https://www.bbc.com/news/world-us-canada-20738732
    Supports: Background coverage of Lanza and the Sandy Hook shootings.