The purpose of this study was to explore the commonalities between school shooters to gain a better understanding of ways to prevent school shootings. The research question was, Understanding the behavioral impact of a maldeveloped or damaged prefrontal cortex, striatum, and amygdala as contributors of psychopathy, to what extent is the relationship between neurodevelopmental disorders, environmental stressors, and trauma in the proposed triadic reciprocality model evidence of conditions that contribute to youth becoming school shooters? The study's multidisciplinary approach in researching areas of neuroscience, psychology, and criminal justice was to explore psychological attributes of neurodevelopmental disorders, the impacts of trauma, and environmental changes that could induce adolescent psychopathy leading to violent tendencies. This study was a comparison of school shootings and shooters in K-12 schools committed between 2000 and 2020 by students 18 or younger, with a search for general themes for analysis to add to the literature on school shooters. This study utilized a qualitative approach of grounded theory, and presented the results of the analysis, with specific regard to emerging themes. The results showed that four components--trauma, environment, neurodevelopmental disorders, and firearms accessibility--were the primary contributors to the majority of shooting events. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]