Authorities in Montana are desperately looking for the killer who hacked a camper to death. The death was originally believed to be a bear attack, until the autopsy.  Witnesses and dash cam help apprehend a rapist and murderer, less than 24 hours after he attacked at woman on a hiking trail in Nashville. And you won't believe the insane reason why a woman torched a mobile home - leaving one person dead. Jennifer Gould reports.