>> reporter: detectives were sure that they had rattled their suspect. the next day, they trailed chris when he left his house. >> and at some point it became apparent that he knew that we were following him. >> reporter: they broke off surveillance and brought chris in. >> chris, have a seat. >> reporter: larry had read all about chris mcamis, and he'd looked at tape of every time chris had been in for an interview. >> here's what the situation is. >> reporter: today, he and chris were going to meet for the first time. >> i have been investigating this case for about two years now as a cold case investigator. >> reporter: larry had a plan to get chris to talk without asking for a lawyer. >> you probably want to know what's going on, what's happening, why you're sitting here. >> reporter: larry promised to fill him in on the case in detail, thinking chris would