Background Fatal mass shootings, defined as four or more people killed by gunfire, excluding the perpetrator, account for a small percentage of firearm homicide fatalities. Research has not extensively focused on the role of domestic violence (DV) in mass shootings in the United States. This study explores the role of DV in mass shootings in the United States. Methods Using 2014–2019 mass shooting data from the Gun Violence Archive, we indexed our data by year and mass shooting and collecte...| BioMed Central