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Chicago PD: 4 dead from Mercy Hospital shooting
03:09 - Source: WBBM
CNN  — 

A triple slaying at a Chicago hospital might have been worse if not for a police officer’s fortuitously placed gun and holster.

A Chicago police officer narrowly avoided injury Monday when a bullet hit his holster and embedded in his handgun, Chicago police Superintendent Eddie T. Johnson said.

“He wasn’t actually struck in his body physically, but his holster was struck,” Johnson said.

Images provided by a police source to CNN affiliate WGN show a bullet-size hole in the holster that rested on the officer’s right hip. A bullet can be seen smashed into the right side of the gun just above the trigger.

Images show how an officer's holster and gun stopped a bullet during Monday's hospital shooting.

In all, a police officer, a doctor and a pharmacy resident were killed in the shooting at Chicago’s Mercy Hospital, Mayor Rahm Emanuel said. The gunman is also dead, although it was unclear whether he died by police gunfire or a self-inflicted wound, Johnson said.

Officials said the shooting was matter of domestic violence, and the gunman had had a relationship with one of the victims, a 38-year-old emergency room physician named Tamara O’Neal. Police Officer Samuel Jimenez was also killed as well as Dayna Less, a first-year pharmacy resident at the hospital.

Johnson praised Jimenez and other officers who rushed toward the gunfire Monday and helped prevent further disaster.

“Those officers that responded today saved a lot of lives,” he said. “There’s no doubt in my mind that all those officers that responded are heroes, and they saved a lot of lives because we just don’t know how much damage he was prepared to do.”