and then jim ramsey and david maxwell got even more bad news. e killer's fingerprints found in diane maxwell's car that were supposed to be in her police case file were also missing. >> it was just like every day was another blow to the stomach. >> i knew they existed. and now they're gone. so, yeah, i was pretty upset about it. >> with all the evidence gone, david now had to tell his father that the case might never be solved. >>> investigators literally had no evidence from diane maxwell's murder. the crime scene photos were gone. the victim's clothing had been discarded. the only eyewitness had died. and the killer's fingerprints were missing, presumably misfiled in one of the thousands of open case files in the houston police department. >> everybody, at some point in time, was looking for that case. so, it wasn't like, okay, well, we'll just do it in our spare time. somebody every day was looking for that case. >> i guarantee, they went through many, many files. a tremendous undertaking. >> debbie and i worked together for 11 years. rumor ha