Fifteen years ago, Catherine helped put a man on death row for the rape and murder of a coed at a nearby college. The man is about to be executed when he's granted a stay based on new DNA evidence. When bodies turn up at the school, killed in identical manners, it's thought the killer might actually be on the loose.

Catherine is called in by a pornographic-film developer to view graphic footage from a snuff movie in which a woman is brutally slain. Grissom investigates an ant covered body that's been dead over a year.