billy hoffman was serving time in prison, convicting of killing ricky cowles. hilling secret that would set off a new investigation. here again is keith morrison with mean girls. >> lancaster, california kicked into the new millennium, nearly three years after ricky cowles was dispatched from all of college of time. two families that might have gone off the rails stayed intact because of an amazing gift he helped create and left behind. her name is kayleigh the man who killed her father before she was born was in prison. the teenager who gave birth to her grew into womanhood, and even ricky's parents the cowles who hadn't liked amy from the start, developed a grudging respect. for >> amy was really good a catch handing out. a beer >> with kayleigh? >> that's right she's great. >> and that might be in the end of the story. life has to go on and they're hours with kayleigh were some of the sweet never had. but they couldn't just erased or one nagging belief that billy hoffman did not act alone when he killed their son. >> even though philippe billy was convicted,