. >> officer ben biddle is with detroit's child abuse unit.local media. >> be on the lookout for this man, caught on tape beating and kicking a very small baby boy. police want you to see the video to help find a child in danger. >> as biddle expects, the police are flooded with calls. >> once we aired it and once we showed what the child was going through, the citizens wanted to get this guy off the street. >> the response is overwhelming. after the story airs on the 11:00 news, the suspect is arrested early the next morning. >> his name is joseph gray, and the little boy is his girlfriend's son. they'd been dating 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 bidd