that's 19-year-old darrell adams who was just shot. she was just wounded from a gunshot. watch this. as he is laying on the ground, two other gentlemen walk up and watch what happens. >> did they shot him? >> they're shot him again. he was killed in the incident, but watch. seconds after the two suspects shoot this guy a second time, the cops paying attention to this viper system were able to radio to an unmarked cop nearby. you can see within seconds that cop pulls up to the scene and apprehends the two guys. that's a pretty effective surveillance system. it turned out to be a 16-year-old and 19-year-old. both were charged with second-degree murder and criminal possession. >> teenagers killing each other. >> it's startlingow casual and guys are walking allegedly shooting him again and throwing away like it's nothing. >> a man checks the videos and look at what he sees. he sees a guy lingering around the cars parked outside of his house. he looks like he is dressed in a cover all and carrying a can. that's the video that continues. he lights the match on the windshield of