S4, E11: Brenda's parents, Cliff (recurring guest star BARRY CORBIN) and Willie Rae (recurring guest star FRANCES STERNHAGEN), visit Brenda, trying to get her to pin down her wedding date. When a murder investigation interrupts the visit, Brenda can't let go of the case and brings her parents along to investigate. Will Brenda slow down when the health of someone close to home is in jeopardy? AMY PIETZ ("Rodney," Aliens in America") guest stars.