In Chicago, a gunman shot and killed three people at Mercy Hospital Monday. The victims include a doctor, a police officer and a pharmacy technician. The gunman was also killed at the scene. Chicago police said the shooter was previously in a relationship with the first victim, Dr. Tamara O’Neal, who was shot outside the hospital in the parking lot before the shooter ran inside the hospital when police arrived on the scene. The other two victims were identified as pharmacy resident Dayna Less and police officer Samuel Jimenez. The majority of domestic violence deaths involve firearms.

A study by the gun control advocacy group Everytown for Gun Safety found the majority of mass shootings between 2009 and 2016 were committed by intimate partners or family.