Jake and McCabe are looking for a serial killer. A reporter who is interviewing McCabe, is asked to leave the room while Jake confers with him. She returns to finish the interview and after McCabe leaves she pulls out a tape recorder she left, and hears Jake tell McCabe that the killer always takes his victim's wedding ring. She then goes out and kills a woman and takes her wedding ring. While she appears to be another one of his victims, Derek notices a few inconsistencies, like he usually strikes on a particular day, and the hair color of his other victims were different from her. Jake eventually catches the killer, and they eventually suspect the woman's husband of killing her. They would discover that her and husband and the reporter were having an affair but he ended it when he chose to stay with his wife. When they suspect the reporter of the murder, they trick her into incriminating her by placing the wedding she took in his car but in reality they switched his license plates with that of a similar car.