Mercy Hospital shooting: 3 killed one year ago today

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CHICAGO — It's been one year anniversary of the deadly shooting at Mercy Hospital.

The former fiancé of Dr. Tamara O'Neal shot her to death in the parking lot outside the hospital.

Then he went inside, where he fatally shot a pharmacy resident Dayna Less and Chicago police Officer Samuel Jimenez.

Police said he fired more than 40 rounds in a shootout with SWAT team officers.  He then took his own life.

Since the shooting, hospitals are now required to provide violence prevention training and risk assessments of facilities.

On Tuesday, Chicago police held a memorial tribute for fallen officer Samuel Jimenez at the 2nd District headquarters, where he worked.

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