Volunteers (S01E16)

Human remains found in the excavation site for a new building lead Rush and Valens to investigate the unsolved deaths of a man and a woman in their mid-20s who disappeared in 1969. After identifying the two as Gerard (Garland Whitt) and Julia (Amber Benson), the detectives delve into the couple's lives, learning they were both active in the 1960's counter-culture scene when they vanished. Gerard and Julia also volunteered for an underground organization that helped women obtain safe abortions when the procedure was illegal. After Rush and Valens locate a woman, Renee (Mary-Joan Negro as 2004 character), whom the couple helped shortly before their disappearance, the detectives find that she could provide the key to uncovering the killer. (Warner Bros. UK)