what's going on with the walmart in the state of ohio? >> it's in direct route between newport news and michigan. >> reporter: but the feds had proof doug had been in virginia when venus disappeared. so how did the ohio receipt get there? detective scott and prosecutors john mcdonough and chuck herman, meeting in their war room, suspected someone else was involved. but if that was true, they had no idea how. that didn't matter to mcdonough, then the youngest elected prosecutor in michigan, who was itching to arrest doug right now. >> i said, "all right, we got him. let's go." >> reporter: green light, this is it. >> let's charge him now. >> reporter: it didn't happen. cooler heads prevailed. >> i had to listen to chuck and detective scott telling me, "calm down. let's get everything ready to go." >> reporter: fact was the investigation was still missing key evidence, not least a body, a major hole -- maybe even a case-buster -- for any would-be prosecution. >> reporter: do you say let's go slow? nobody's going anywhere. let's see where this take us.