In the early morning hours of February 4th, 2012, Troy and LaDonna French were gunned down inside their North Carolina home. The couple awoke to screams from their teenage daughter who said there was a man inside her room holding a knife to her throat. But before the gunman fled the home, he left a few blood droplets on the staircase. Could new advancements in DNA technology finally track down the man responsible for murdering the Frenchs?