and really, there could be nothing worse than seeing a joe luna walk out of your closet. >> in march of 2006, luna asked the jury to give him the death penalty. they willingly obliged. >> there are certain people in our society that have absolutely forfeited their right to live among us by their own actions and by their own decisions. joe luna is one of those people. >> ironically, joe luna tried to cover up his crime by burning the evidence, but he didn't destroy it. instead, he made those tiny glass insulation fibers more distinctive. >> it was actually the last way that i thought they would catch him. that was furthest from my mind it would be in a vacuum. >> you have to have the forensics. you have to have the evidence that can't skip town. you have to have the evidence that can't lie to you. >> as my old professor once said, there is no such thing as a perfect crime. that's, you can plan, you can calculate, you can try to manipulate the circumstances or the surroundings, but you will always leave a piece of trace evidence behind. >>> love you! >> a 13-year-old girl went missing f