but as time goes on, as you know, and the leads diminish, there just comes a point in time where just -- there's no more trails left. >> each week, as more and more fingerprints were added to the houston files, examiners would compare those to the prints from diane maxwell's mustang. with no success. >> we were confused. we thought -- we expected that it would be resolved. you know, you had the funeral and everything. then you did begin to think about the resolution. and so it was very, you know, upsetting and hurtful that there was no resolution. >> eventually, the trail of diane maxwell's killer turned cold. and for 17 years, there was virtually no progress. nonetheless, diane's father never lost hope. >> every time i would see him, he'd say, son, i want you to solve this case before i die. i want to know who killed diane. >> our parents were quite