This graphic shows data for each of the mass shootings in the United States over the last 15 years. The diagnosis listed did not necessarily cause the rampage.
States by population (2010)
Deaths by firearm per 100,000 (2010)
By age of accused perpetrator
Did the accused perpetrator commit suicide?
Complete list (includes spree killings)
SOURCE: Mother Jones, NYT, LA Times, Milwaukee Journal-Sentinel, AP, Arizona Republic, Washington Post, Henderson Gleaner, North Illinois University, Seattle Times, CNN, Meridian Star, Chicago Sun-Times, Violence Policy Center, Honolulu Star-Bulletin
Chiqui Esteban, Patrick Garvin/Globe Staff