Rosa McMillan (9 of Hearts, North Carolina)

On August 6, 1989, Rosa McMillian was found murdered inside that home. She had been brutally attacked—and sexually assaulted—in her own living room. The crime scene didn't make sense, and a few mysterious items were left behind by whoever killed Rosa. Something else left behind? The killer's DNA. In most cases, that would be enough to close the books. But in Rosa’s case…DNA isn’t what brought answers. In fact, it’s the opposite…and the one thing that would keep a solve out of reach.