. >> his name is joseph gray, and the little boy is his girlfriend's son.ating just a couple months. she was sitting outside in the car while the beating took place inside. police say they showed her the video for the first time. >> she saw the video, and she broke down crying. she's real distraught by what happened. >> with his cruel behavior caught on camera, joseph gray pleads guilty to second-degree child abuse. >> it made it real hard for him to deny it. the tape closed this case, period. >> officer biddle wishes he could have this type of hard evidence in all his child abuse cases. unfortunately, these sad crimes most often take place behind closed doors, and biddle knows that well. he says he, too, was abused as a child. >> it took a toll on me. that's why i'm at the unit that i'm at. in my heart i thought i'm going to make a change for other kids. >> in his statement to police, joseph gray says he was also a victim of child abuse. at his sentencing he expresses remorse for his behavior. >> i want to apologize for what i did. i know it was wrong. i w