https://www.theviolenceproject.org/mass-shooter-database/
5 profiles of mass shooters
Experts have long cautioned that there is no single profile for a mass shooter. But the Violence Project researchers found some personal characteristics often align with certain types of locations targeted by shooters, and created five general categories:
K-12 shooters: White males, typically students or former students of the school, with a history of trauma. Most are suicidal, plan their crime extensively, and make others aware of their plans at some point before the shooting. They use multiple guns that they typically steal from a family member.
College and university shooters: Non-white males who are current students of the university, are suicidal, and have a history of violence and childhood trauma. They typically use legally obtained handguns and leave behind some sort of manifesto.
Workplace shooters: Fortysomething males without a specific racial profile. Most are employees of their targeted location, often a blue-collar job site, and have some grievance against the workplace. They use legally purchased handguns and assault rifles.
Place of worship shooters: White males in their 40s, typically motivated by hate or domestic violence that spills out into public. Their crimes typically involve little planning.
Shooters at a commercial location (such as a store or restaurant): White men in their 30s with a violent history and criminal record. They typically have no connection to the targeted location and use a single, legally obtained firearm. About a third show evidence of a “thought disorder,” a term for a mental health condition, like schizophrenia, that results in disorganized thinking, paranoia, or delusions.