CHICAGO (AP) — An argument outside a Chicago hospital turned deadly when a man pulled out a gun and killed an emergency room doctor with whom he was having a domestic relationship, then ran into the hospital and fatally shot a pharmacy resident and a police officer.

Police say the attacker, 32-year-old Juan Lopez, also died Monday but it was not clear if he took his own life or was killed by police at Mercy Hospital on the city’s South Side.

The victims were identified at 38-year-old emergency room physician Tamara O’Neal and 25-year-old pharmacy resident Dayna Less. Police say the slain officer was 28-year-old Samuel Jimenez, who was married with three children.

Police say Lopez was O’Neal’s former fiance.