headquarters in new york. she was a mom looking for her baby, and her baby hadn't come home. >> reporter: cathy's week had been nothing but trouble. >> she couldn't tell me what happened. >> she was so upset. >> reporter: it was about to get much worse. >> my mom would say "if you find the car, you'll find cathy." >> you didn't want it to be dark because you wanted to keep looking. >> she was stabbed multiple times. there was blood within the interior of the car. she was a targeted victim. >> reporter: who killed cathy? >> we had no witness. we had no confession. we had no dna. >> reporter: 20 years went by. >> i still had to keep looking for what i had lost. >> reporter: but cathy had her. and she had him. >> i put a lot of faith in god. darren was his tool. >> and the killer? he never had a chance.