bianchi got a used car, loaded the trailer with all of his belongings in it, and drove up to washington. >> friday, january 12th, 1979, nearly one year after cindy hudspeth was discovered dead in the trunk of her car, the hillside strangler case has gone completely cold. then in bellingham, washington, two college roommates, karen mandic and diane wilder, mysteriously disappear on their way to a house-sitting job. within hours, their bodies are found stuffed inside the trunk of mandic's car. the next day, police identify and detain a suspect, a security guard named kenneth bianchi. coming up -- >> i'm a dual personality. i didn't do it. phillip did it harry did it. peter did it. >> a killer's desperate attempt to clear his name. >> i [ bleep ] killed those broads. you know, to smarten him up, to show him he couldn't push me around. [ female announcer ] over the last ten years,