rothstein, barnes and the rest, fractured intellectuals, broken souls who lost their humanity on a dissent into evil. ♪ ♪ ♪ . i'm craig melvin. and i'm natalie morales. broken souls who lost their humanity on a descent into evil. humanity on a descent into evil. . i'm craig melvin. >> andsthumaniou weir i'm nata >> and this is "dateline." in the pit of my s is "datel" in the pit of my . >> in the pit of my stomach i knew something is not right here. i felt something bad must have happened. >> he must have been so, so scared. >> they were so happy at first. >> kevin just felt morgan was very, very charming. >> but when the marriage went bad he went missing. >> he just disappeared. >> was this a husband who didn't want to be found? was this a wife who had something to hide? >> they're getting in the truck. they're leaving. >> what happened behind closed