the important evidence we start with is the hair and fiber evidence that was recovered off of karmen smith'sn knife blade. it was a fairly clean crime scene, other than that. >> karmen had small puncture wounds on her back and terrible bruising, suggesting a ferocious struggle. >> she had been not only tortured and murdered, but she had been undressed at some point and redressed. >> at karmen's bedside, the hammer she had wanted for peace of mind. never touched as she fought for her life. not far away was the suspected murder weapon, a piece of rope. crime scene technicians dusted for fingerprints and collected blood samples. the evidence was sent to the state crime lab for analysis. >> the lab tests kept coming back without the physical evidence that we needed, that linked him to the dead body of karmen smith. that's when we knew that it may always be a circumstantial case. >> and the circumstantial part of the case was too weak to make an arrest. prosecutors believe daker was the only viable suspect. they didn't have the evidence to prove it. the investigation stalled. >> so waseem daker w