lives all changed in an instant. a home invasion and burglary in broad daylight. a woman fighting for her life. and now a perpetrator on the loose. >> you don't know whether you have a guy on the move who could be ready to bust into another house along here, right? >> exactly, exactly. we don't know if we had a mad man on the loose here, you know? >> you settin' up security on these streets? >> on every one of these streets, we're goin' to every one of these houses. we're stoppin' anything that comes in or comes out of this whole neighborhood, we're talking to everybody. >> it's your neighborhood. and -- >> yeah. >> there's somebody out there who's apparently a very violent person. >> yes. >> you gotta be terribly scared. >> i was. i'm thinking that there's someone who's walkin' around the neighborhood watching and seeing when people are leavin' and basically attacking or -- >> reporter: on hot springs drive, the investigators knew they had a serious crime on their hands, but as they learned more from that bloody scene, the shockwaves only kept rolling. coming up -- >> he said, "oh god. no, no, kay."