* Tribune…

A Chicago police officer and two other people were killed in an attack at a South Side hospital Monday afternoon that sent medical personnel and police scrambling through halls, stairwells and even the nursery in search of victims and the shooter before he was found dead.

Officer Samuel Jimenez, on the force less than two years, was gunned down as he went to the aid of other officers who had been called to Mercy Hospital & Medical Center around 3:20 p.m. about an assault. Jimenez, 28, was married with three small children. He’s the second Chicago police officer killed in the line of duty this year, the most since 2010 when five officers were fatally shot. The first was Near North District Cmdr. Paul Bauer, killed Feb. 13 outside the Thompson Center.

“Those officers that responded today saved a lot of lives,” said Chicago police Superintendent Eddie Johnson. “They were heroes because we just don’t know how much damage (the shooter) was prepared to do.”

Police had been called to the hospital after Juan Lopez, 32, confronted emergency room doctor Tamara O’Neal, apparently over a “broken engagement,” sources said. By the time Jimenez and his partner arrived on the scene, Lopez had shot O’Neal repeatedly, standing over her as he fired the last shots, according to police sources and witnesses.

“When they pulled up, they heard the gunshots, and they did what heroic officers always do — they ran toward that gunfire,” Johnson said. “So they weren’t assigned to that particular call, but they went because that’s what we do.”

That’s very true.

* There were some other heroes as well. If you have time today, listen to how the police dispatchers handled this horrible incident. They were calm professionals under pressure who helped focus and organize the police response…

[Hat tip: Eric Tendian]