but in twoivgs doug larrison took over the case.ed if anything else from the car might yield a more complete dna profile and sent michelle's blood-stained dress back to the lab. >> got the call from the analyst they had found a full dna profile on the dress. that's exciting. >> that's and are you sitting down phone call in. >> correct. all we had to do is submit it to code is. >> codeis? >> it contains millions of dna profiles collected from crime scenes, from jails, people who have been arrested. >> did anything come back? >> nothing, no hit. >> to larrison, that meant michelle's killer was likely someone without prior arrests or run-ins with the law. that meant the people police talked to back in the day had to be reconsidered. >> my thinking is, let's start going through this case, finding potential suspects and go get their dna and start eliminating them from that partial profile. >> so now we're back to andy and all those other boyfriend in. >> correct. >> nearly 30 years after michelle's death everything old was new again. boy