no, burbridge wondered, did she hire him?world, wives kill husbands. >> but then they heard a curious story from a neighbor. that very evening for a couple hours before the shooting a mysterious white van was parked just across the street from the carliles' house. >> 911, what are you reporting? >> of course, in many if not most neighborhoods in america, a parked white van might not attract a bit of attention. >> this is the south hill after all. nondescript white vans don't just show up and hang around here. so the neighbor noticed, and then doug carlisle winds up murdered. >> we didn't know if it was related or not, but it was something we considered immediately. >> and again, this being the south hill, another neighbor had the wherewithal to provide a special kind of help. >> a homeowner had a video camera that covered his driveway and we picked up what we thought was the van about two hours before the murder. >> here it is, that video. and sure enough, a white van coming and going on the streets of south hill that night.