so burbridge wondered, did she hire him?ationship is a probability. >> reporter: but then, up at the house, they heard a curious story from a neighbor. that very evening, for a couple of hours before the shooting, a mysterious white van was parked just across the street from the carlile's house. >> 911, what are you reporting? >> hi, um, i just -- i called crime check because there's a suspicious vehicle in front of my house like 30 minutes ago. and now they just came back and they're just sitting there, and i'm really freaked out. >> reporter: of course in many if not most neighborhoods in america, a parked white van might not attract a bit of attention. >> maybe i'm just being paranoid, but it's really bizarre that a van like that would be in this neighborhood. >> reporter: but 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 carlile winds up murdered. >> we don't know if it was related or not, but it was obviously something that we co