dunton: the apartment was immaculate. it was cleaned. it was scrubbed.d been repainted -- like, three or four coats of paint. narrator: no proof of murder was found there, not even, to the surprise of forensic technicians, in the bathrooms. dunton: bathrooms are like petri dish for forensic biology, and not one single source of dna was recovered from the bathroom area. narrator: analysts now turn to the black garbage bags found with bill's body. after his murder, melanie gave some of his clothes to a family friend and packed them in black garbage bags. we learned that these garbage bags were made from reprocessed plastic. narrator: which meant the chemical composition of these bags was distinctive, and in this case, both sets of bags, the ones found with bill's body and the ones melanie used to pack his clothes, were chemically consistent. even worse for melanie, as plastic is cut to make individual bags, a blade leaves distinctive tool marks along the perforated edge of each bag. as the blade dulls, those marks change. bags cut within seconds of each ot

dunton: opening up the suitcase, there were more black trash bags similar to the first one.