[SS.I 4.0] Dr. Langman presents his four-pronged model of the factors that contribute to school shootings. This article discusses Evan Ramsey, Kip Kinkel, Eric Harris, Adam Lanza, and Nikolas Cruz. Reprinted with permission from L.W. Collins, T.J. Landrum, and B.G. Cook, eds., Issues Around Violence in Schools, Advances in Learning and Behavioral Disabilities, vol. 33, (Leeds: Emerald Publishing Limited, 2023).

This article examines five school shooters and five perpetrators of other types of mass violence. The five school shooters are Eric Houston, Eric Harris, Seung Hui Cho, Adam Lanza, and Elliot Rodger. The other perpetrators are Timothy McVeigh, Clay Shrout, Anders Breivik, James Holmes, and Dylann Roof. The article was originally published in Criminology and Public Policy and is posted here with permission. 

This article draws on new material made available in 2014 and 2015, including both official reports and Lanza’s online presence that has been discovered and documented by Reed Coleman. The article was originally published in the Journal of Campus Behavioral Intervention (J-BIT) 3 (2015), 1–11. It is reprinted with permission of the National Behavioral Intervention Team Association (NaBITA).

[SS.I 4.0] This document chronicles Adam Lanza’s life and noteworthy activities leading up to the Sandy Hook shooting. Version 2.0 has been greatly expanded. (Special thanks to Reed Coleman.)

This document provides crucial information from Lanza himself regarding what appears to have been his first psychotic episode.

This is an annotated transcript of Lanza’s recordings that he posted on YouTube in 2011–2012, but which were not discovered until 2021.

On 20 December 2011, Adam Lanza called in to John Zerzan’s talk radio program AnarchyRadio to discuss a domesticated chimpanzee that turned violent. 

This document contains the text of every surviving post made by Adam Lanza to the forum “Shocked Beyond Belief,” under the username “Smiggles,” with commentary by Reed Coleman. To see these posts in the context of the complete discussion threads, see the document “Shocked Beyond Belief”: Complete Threads. (Special thanks to Reed Coleman.)

This is the spreadsheet (or part of it) that Lanza created where he documented information about killers. The file name as it was released to the public was colgam01. According to Reed Coleman, this is an abbreviation of “Columbine Game.” See “Adam Lanza’s ‘Shocked Beyond Belief’ Posts.”

Originally released as “CFS 1200704597,” these 81 documents from the Connecticut Department of Emergency Services and Public Protection have been combined into a single PDF file. The original file names have been added in searchable form to each page of the document, and the associated bookmarks function as a table of contents (we recommend downloading the document and using the bookmarks pane in your PDF viewer to navigate).

Originally released as “CFS 1200705354,” these 19 documents from the Connecticut Department of Emergency Services and Public Protection have been combined into a single PDF file. The original file names have been added in searchable form to each page of the document, and the associated bookmarks function as a table of contents (we recommend downloading the document and using the bookmarks pane in your PDF viewer to navigate). The table of contents file has been moved to the front of the stack.

This document contains numerous school assignments of Adam Lanza’s going back to grade school, as well as other materials. Some pages are completely redacted. 

This searchable document contains the entirety of every (extant) thread on the forum “Shocked Beyond Belief” to which Adam Lanza posted (under the name “Smiggles”). The threads are ordered chronologically by the date when Lanza first posted to each one; but keep in mind that he sometimes returned to threads again later on. To read his individual posts in order, please see the companion document Adam Lanza’s “Shocked Beyond Belief” Posts, which contains cross-references to this document. Version 2.0 includes newly discovered posts. (Special thanks to Reed Coleman.)

In the initial aftermath of the attack at Sandy Hook, it was reported that Adam Lanza had deleted his computer files. Among other details of the investigation, this document provides information regarding Lanza’s electronic files that investigators were able to recover. In addition, there is a summary of “The Big Book of Granny,” a piece of writing created by Lanza and a peer. The story includes a character who states, “I like hurting people … especially children.” Also, in one “episode,” Granny’s son shoots her in the head; in other words, a son shoots his own mother in the head. This is what Lanza ended up doing in real life.

This report presents recommendations on school safety in three domains: Safe School Design and Operation; Law Enforcement, Public Safety, and Emergency Response; and Mental Health/Mental Wellness.

This is the official report by the State’s Attorney, Stephen J. Sedensky, III, documenting the investigation of the attack by Adam Lanza.

This report was released on November 21, 2014. It reviews Lanza’s contacts with medical and mental health professionals and the missed opportunities for intervention.