Victim's Brother Angry at Alleged Pa. Hospital Gunman

Mental health caseworker, Theresa Hunt, was killed during the shooting involving psychiatric patient Richard Plotts, say police.
2:02 | 07/27/14

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Transcript for Victim's Brother Angry at Alleged Pa. Hospital Gunman
I am kind of angry at the gentleman did live. -- -- -- -- -- -- -- -- Dennis -- little sister 49 year old Teresa Heinz is gone shot dead authorities say. At the hands of -- plots he says his sister was one of the youngest of nine siblings but she loomed large in the family. They called her Mother Teresa. Fielder and unlike sister of someone who is strong. And stand up forcibly enter and and. These are crime scene photos of the bloody aftermath of broken window shattered by one of at least ten shots fired in the small psychiatric office at mercy FitzGerald. Investigators say plots who suffers from mental illness was angry the hospital posted signs it was -- free. He allegedly pulled his weapon shot -- caseworker -- in the head then turned the gun on a psychiatrist. Doctor Leigh Silverman. Who suffered a graze wound but quickly pulled his own gun and shot plots multiple times district attorney Jack Whelan says -- had more than three dozen rounds of ammunition on him. When you're coming into a facility -- you have bullets in your pocket. And you have a revolver in your waist band there's only one intent and that is to read loan that's why you have those bullets your intent is to -- -- -- and others say doctor -- likely prevented further carnage came through the Doctor Who actually move armed I think. What an incredible when he did. Today detectives search boxes Clifton heights apartment sources say other guns were found and it appears the 49 year old career criminal was -- border. -- on it still doesn't understand why his sister was shot especially after a -- at mercy FitzGerald. Told -- this. Two -- He always had -- she's done so much for me I know there's so much and I just minutes. I -- makes all the harder.

This transcript has been automatically generated and may not be 100% accurate.

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