Chicago (CNN)- A police officer, a doctor and a pharmaceutical assistant were killed after a Monday afternoon shooting at Chicago’s Mercy Hospital, Mayor Rahm Emanuel said.

The shooting was a domestic incident see as the gunman’s first victim was a woman he had previously had a relationship with, said Chicago Police Superintendent Eddie T. Johnson.
The gunman also died, though it is unclear whether he died from police gunfire or a self-inflicted gunshot wound, Johnson said.
In a statement Monday, Mercy Hospital named its employees killed in the shooting as emergency room physician Tamara O’Neal and pharmacy resident Dayna Less — a 25-year-old recent graduate of Purdue University.
The hospital paid tribute to police and security staff, saying it was “deeply saddened by the tragedy.”
“Every shooting in America is a tragedy, and it is especially senseless when a shooting occurs in the healing space of a hospital,” it said.
Chicago Police identified the deceased officer as Samuel Jimenez, a father of three. He joined the force in February 2017 and recently completed probationary training, becoming a full-fledged officer, Johnson said. A procession was held for him Monday night.