A woman's murder shines a light on an unsolved mystery from years earlier. As the connection between the two cases becomes clear, a long-hidden truth surfaces. Could a master manipulator be behind both crimes? Andrea Canning reports. Listen to Andrea Canning and Blayne Alexander as they go behind the scenes of the making of this episode in ‘Talking Dateline’: https://link.chtbl.com/tdl_deadlyomission