that was our job, to find him. >> but it wouldn't be easy. margarette eby's murder took place many years earlier, and nancy ludwig was murdered in detroit, over 75 miles away from flint. but investigators suspected that the killer drove a monte carlo automobile and had access to twine used by landscapers. the hotel employee's boyfriend who owned the monte carlo had an alibi for the night of nancy ludwig's murder, and he was no longer considered a suspect. >> most of the times, killers are pretty stupid, and we catch them for some pretty stupid reason. he was very clever, very clever and very thorough. >> as the years passed, all 22,000 leads in the case were tracked down in one way or another. and all were dead ends.