The Paula Zahn show is on my DVR and I hope to watch it tonight.
I agree though that the truck is at the center of all of this; however, if the killer did not own the truck, that could be harder to track down. Especially if they borrowed it from an acquaintance or someone not immediately related to them.
I keep going back to the black truck that was pulled over and questioned mere minutes after the murder and very close to the scene. Either this was the killer or it was one of the world's biggest coincidences IMO. I can't image they wouldn't have this person's name if they stopped them to talk to them. Just don't have any/enough evidence to charge them or even get a warrant perhaps? Knowing not a whole lot about the law, would "truck matching description of a murder close by" be enough cause to search this vehicle? If not, and if the driver didn't consent to a search, they could have had their costumer/wig hidden away on the floor, under a seat, or wherever.