Robin Warr Lawrence was 37 years old in 1994 when someone broke into her Virginia home and stabbed her 49 times ... killing her and leaving her 2-year-old daughter alone for two days until a neighbor discovered her body. For years, police couldn't find a culprit ... until new DNA testing led them to a man who claims he would've been a serial killer if not for his wife and children. The whole story's being laid out in a new episode of " 48 Hours " which will introduce the world to Stephan Smerk .

Tag-uri: DNA