Three homicide investigations -- involving a carjacking, a rape, and a bar fight -- are unfolded in a series of flashbacks from the viewpoint of both the homicide detectives and the victims' families, the latter having formed a support group. A surprise development occurs when the group welcomes a new member -- medical examiner Julianna Cox (Michelle Forbes). Meanwhile, two of the elusive witnesses in one of the three cases compel Pembleton (Andre Braugher), still not fully recovered from his stroke, to embark upon a grueling chase. ~ Hal Erickson, Rovi