all this fun driven by your northern california honda dealers.le featured in this episode, visit norcalhondadealers.com. ♪ ♪ ♪ >> reporter: their most promising lead, that police sketch of a possible suspect, never got an i.d. >> there were several possible prints, but they were poor and not very useful. >> if fingerprints were lifted, would they have been preserved? >> we're talking 30 years now. >> right. >> and basically all the photos have been destroyed, the prints have been destroyed. >> reporter: and yet again, old-school crime-solving is futile, leaving it for cutting edge dna technology to save the day. but genealogist cece moore's got -- has been able to identify two of ben's second cousins. she traces their family trees, all the way to their great grandparents. she then builds the family trees forward with their decedents. poring over obituaries, gravesite locators, and census records she had it down to two women. sisters. one who would be ben's aunt, and the other, would be his mother. >> how certain did you feel that you had the righ

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