Tulsa Volunteer Sheriff's Deputy Charged With Manslaughter

Authorities say the 73-year-old deputy accidentally grabbed his pistol instead of his stun gun during the suspect's arrest.
3:18 | 04/14/15

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Transcript for Tulsa Volunteer Sheriff's Deputy Charged With Manslaughter
much. All right, George, thank you. To the fatal police shooting. This one in Tulsa, Oklahoma. A volunteer reserve deputy sheriff has been charge Rd manslaughter after shooting an unarmed man. Authorities say he reached for his taser but accidentally grabbed his handgun. Ryan smith has that story. Reporter: This is the moment an undercover operation turns tragic. As Tulsa departments were chasing 44-year-old Eric Harris, running from police after allegedly selling drugs and guns. Roll on your stomach. Reporter: No one expected this. Oh, I shot him, I'm sorry. Reporter: Robert bates shooting the unarmed man, after he mistook his gun for a stun gun. He shot me! He shot me! Reporter: You can hear the 73-year-old apologizing. Oh, I shot him, I'm sorry. Reporter: Harris passed away after the shooting. On Monday, bates was charged with second-degree manslaughter. He used a deadly force. No one intended for Mr. Harris to die that day. Reporter: Those words lacking comfort for Harris' grieving family. He was peaceful. He was loving. He was caring. And he was my brother. That I'll never see again. Until I see him in heaven. Reporter: The shooting sparking outrage on social media. One user tweeting when will police killings stop? Another, the video is heart breaking. And nauseating. This morning, many are asking why bates, an insurance company executive, who has been acting as a volunteer deputy since 2008 was even on the scene in the first place? For "Good morning America," Ryan smith, ABC news, New York. Our thanks to Ryan. We bring if ABC's Dan Abrams to weigh in. The charge of manslaughter? It means it was a criminal mistake. He'll say on the one hand this was a regular mistake, that any person could make. The prosecutors are saying, no, there's more than that. There's a reasonable duty of care you have to use. You didn't use it. You violated it. You move from being just a mistake to a criminal mistake facing the possibility of two to four years behind bars. How do you think this will play out? There will be basic agreement he didn't do it on purpose. I don't think anybody will argue that he did it intentionally. They'll argue over what should that mean? They'll go through moment by moment, what happened? How did it happen? And would an ordinary person, someone using reasonable care have done what he did? I think he'll try to use, by the way -- The volunteer reserve deputy sheriff. Many people hadn't heard of that before. That will be part of the defense. I didn't do this regularly. This is the sort of innocent mistake someone like me could make. Prosecutors will say not to innocent. It will be interesting to see how this plays out. We turn to Hillary Clinton,

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

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