missing person case, this is a murder. >> reporter: it michigan's upper peninsula, october 2014, christopher reganrded missing from iron county. chief rizzo is on the case and learns regan has been sleeping with a married woman named kelly cochran. she questions kelly and husband jason and sees red flags right away. what's your initial reaction when you meet them? >> watching and listening to the interviews, you know, at that point i knew that there was -- something wasn't right, there was most definitely a possibility of their involvement. >> hi, i'm chief rizzo with iron county police, nice to meet you -- >> reporter: chief rizzo wonders if jealousy over the affair may have something to do with the missing man. she eventually gets a search warrant to enter the cochran house. police gather evidence. but make no arrests. then, under the cloak of darkness, the cochrans flee to indiana. >> normal people pack their things and take them, they don't just leave everything behind. which is what they did. >> reporter: the neighbors they left behind in michigan tell chief rizzo the cochrans began behaving