murder, 12 years after the fact. >> dna is a piece of evidence, but we want to find out if alexander bennett part of this >> the day after their plane was wheels down, detective childs was face to face with their target >> at first, the detective kep it vague, trying to confir that bennett had indeed been i baltimore at the time of the murder, the year 2000. bennett said he was, he ha spent about a month on the streets there after bein ditched by some friends on their way to a concert >> then the detective played his hand, laid out the reaso for his visit. >> this girl's fingernails wer take at the time of her death. >> bennett did have an explanation, and i had nothing to do with committing murder i the house. >> he remembers a confrontatio that he had at a bus stop with a female in maryland, in baltimore, right around th time of the murder >> iraq harness cared because, you know, i was trying to figh back, and i think i heard her, i am not sure. >> the detective didn't, by an thought he used bennet storied's advantage. he presented bennett wit several photographs, a technique police typica