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before we even ended up at that home. so he had a good little jumpstart on us. narrator: and he apparently made it back over the border. for those seeking justice for sierra, this was a disaster. mancuso: we were continually working with the fbi and the u.s. marshals to try to find this guy and bring him back to get him here, at least to get a dna sample and question him about what he did that night and what was going on that night. narrator: but they didn't know who he was or where he was and had only a vague idea of what he looked like. the case stalled for nearly six long years. yeah, that frustrated me a lot. narrator: investigators shared the family's frustrations. they had the killer's dna, but with no other clues, it was all but useless. mancuso: i think any time any murder occurs and you're trying to solve it and you can't, it's very frustrating. i always felt like we were going to solve it because we had dna.