Based on

Movies like Murder C.O.D. (1990)

Someone is killing people in Portland, Oregon, and later blackmails the relatives, who profit most from the death, to pay him for this "service". Captain Murtaugh leads the police investigation. When his wife starts feeling stalked, he suspects his current case is related to his last one in Chicago. He never told his wife the whole truth about what happened - now he has to fear for her life.