Newport Beach, Calif., Doctor Found Shot, Killed in His Office

A former patient of Ronald Franklin Gilbert is the prime suspect in his killing.
1:48 | 01/30/13

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Transcript for Newport Beach, Calif., Doctor Found Shot, Killed in His Office
Her last day on friday. Now, a bizarre murder story out of newport beach, california. A doctor found shot several times in his office. The prime suspect, a former patient. The motive is a mystery. Abbie boudreau has the story. Reporter: This morning, investigators are trying to figure out why this prominent california doctor, seen in these commerci-- I've had the satisfaction of helping thousands of patients -- Reporter: -- Was gunned down in his office. This man, stan elkins pulled out a gun and shot dr. Gilbert multiple times in the chest. The suspect was calm, in the room, investigator able to take him into custody. Shocked. Confused. Every time we know him, I guess not. Reporter: Later today, he'll be arraigned for homicide. Why he opened fire on his doctor remains a mystery. Produces the results my patients desire. We're used to fixing things. We're fixers. Reporter: Known for treating men with sexual health problems. That's probably the worst part of this. We get into the field to deal with these people and they end up taking it back on us. His prostate. He has a lot of problems and the operation, he thought, harmed. Reporter: And in his voice mail recording. Hello, I have a 50% hearing loss. Reporter: He says he's hard of hearding. He reportedly told a neighbor, I'm not going to be alive much longer. In the end, it was his doctor whose life was tragically cut short. For "good morning america," abbie boudreau, abc news, los angeles.

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

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