The Mass Shooting Tracker is a crowd-sourced database of U.S. mass shootings. We define a “mass shooting” as a single outburst of violence in which four or more people are shot. This is not the same as mass murder as defined by the FBI. Learn more here.
John E. Perteet
Unknown (domestic violence shooting)
Bryce Bellomo (victims included 2 of gunman's in-laws)
Gary Martin (killed victims were gunman's co-workers)
Unknown (victims inlcuded 14-yr-old)