behind by people who were in the house and shed the hairs naturally. when cheryl miller struggled with the killer, the expert testified, the hairs came off the rug and stuck to her body. as further proof they came from the rug and not the killer, some of the hairs he testified came from an animal. but what about the startling defense claim that the killer was sterile and ferris was not? prosecutors now had a new explanation for that evidence as well. >> there were no sperm on that slide. >> saginaw county's current chief medical examiner testified that the pathologist who told police that they were looking for a sterile killer 30 years before was simply wrong. in fact, the m.e. testified that the substance was not semen at all, but came from the victim instead. and that conclusion was backed up by another scientist who'd examined slides of the substance taken from the victim's body. >> the test was negative for the presence of seminal fluid. >> prosecutors wanted to put ferris in prison for life