Integrating the Literature on Lethal Violence: A Comparison of Mass Murder, Homicide, and Homicide-Suicide
With 43 attacks claiming over 200 victims, mass killings reached a forty-year high in 2019. Defined as the killing of four or more individuals (excluding the offender) within 24 hours, mass murders are incredibly rare events that account for less than 1% of all homicides (Krouse & Richardson, 2015). Despite their rarity, mass killings disproportionately impact policy due to widespread public concern.