Post Mortem | The Boy Who Killed His Twin

48 Hours correspondents Anne-Marie Green and Erin Moriarty discuss the case of Ben Elliott, who admits to stabbing his twin sister when they were teenagers, but has an unusual defense: he was sleepwalking when he killed her. They discuss the science of sleepwalking, Ben’s strange demeanor in his police interrogation, and Erin’s interview with Ben in jail.