No Corpus Delicti Forensic Files : Season 9 Episode 4

A woman disappears without a trace; even though foul play is suspected, the leads don't pan out and the trail turns cold. Twenty years would pass before police are able to link a clump of hair discovered in an isolated area with the missing woman. Members of "NecroSearch," a group of volunteer forensic scientists, searched a remote area of Colorado a meter at a time, found the victim's body, and gave authorities the evidence they needed to bring the killer to justice. [also marked as S9:E5]