Pa. Hospital Gunman Went to Appointment Determined to Kill: Police

New details emerge about how Richard Plotts allegedly killed his social worker and had a shootout with his doctor.
1:47 | 07/25/14

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Transcript for Pa. Hospital Gunman Went to Appointment Determined to Kill: Police
It was only one intent. When you're coming into a facility -- you have bullets in your pocket and you have a revolver in your waist band is only one intent and that is to relocate. Investigators say 49 year old Richard plots was keeping his regular appointment with a psychiatrist. Doctor -- government. But they say -- went there yesterday determined to kill his doctor. They say he was angry because the hospital posted a sign declaring the building a gun free zone. The DA says -- was agitated and refused to sit down next to a social worker Teresa hunt. He says he pulled a gun from his waist band and shot hunters point blank in the side of the head killing her instantly. Doctor Silberman crouched behind his chair pulled a gun from his pocket and fired six shots he hit -- twice in the chest and in the arm. Another case worker and a Doctor Who heard the shots came running to help. After he heard the shots fired. This case worker then went back into the room and engaged in a wrestling match with mr. plots. These are photos of the crime scene obtained exclusively by action news they show -- shattered window from the gunshots. There are also pictures of the blood splattered office including these bloody hand prints on the carpet left by -- as he tried to crawl away before he was subdued. -- had a long history of mental health issues and arrests -- bank robbery gun charges and drugs. Investigators don't know yet where he got the gun he used yesterday. Doctors government's gun was legally registered and he had a permit to carry. I believe that if the doctor did not have a firearm if the doctor did not utilize the firearm. -- be dead today and I believe that other people. In that facility. Would also be --

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

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