and trapped within the hinge of the scissors appeared to be blue colored fibers. we knew that ms. o'neill had been wearing a blue colored garment that had been cut. >> caballero maintained denise had never been inside his apartment. but under a cardboard box investigators found a gym membership card. >> and when i picked it up and turned it over and it had denise o'neill's name on it, i was ecstatic. >> detectives believe this clue was left at the scene by a desperate denise o'neill. >> my first question was, have you ever detailed denise's vehicle? luis caballero's response was he never has been in her car or never detailed her car. >> but analysts found caballero's prints inside denise's car. when faced with this evidence, caballero changed his story.