Why Did Eric Kill

When a child goes missing, you do anything and everything the police ask you to do -- because those first hours can be critical to solving the case. But when hours turn into days and weeks, or even months and years, there's desperation and a willingness to look anywhere for answers. John and Magi Bish needed to find their daughter, Molly, who disappeared in 2000 in the town of Warren, Mass. And they've been willing to work with or without the police to find out what happened to her. Last winter, Correspondent Susan Spencer reported on this case from a small town that's become home to a large web of suspicion.