This book resulted as part of a comprehensive and ongoing research project investigating the causes of K–12 school violence and disturbance in America. Between 2008 and 2012, all publicly available lists and news reports were scoured to obtain a population of names of perpetrators who committed violence on kindergarten to 12th-grade school property or at a school function since the 1700s (approximately 500-plus incidents initially identified).
Then the deceased, released, un-adjudicated, and otherwise un-locatable individuals were eliminated from the sample (decreasing cases to approximately 120 incidents). Finally, state correctional systems were extensively searched to determine the number of these offenders who were still alive, incarcerated, and able to be contacted.
This resulted in a list of 78 school violence incidents and offenders who committed their acts of violence in 33 states across the United States between 1979 and 2011.
Crews, G. A. (2016). School Killers Speak: A Comprehensive Examination of Perpetrators, Events, and Characteristics of K-12 School Violence in America. The Veritas Group, LLC.