nothing. >> reporter: but burbridge had seen a thing or two. he pushed. >> we're going to start talking about some things honestly, here. >> okay, that's fine. >> and i'm going to have a heart-to-heart with you. >> okay, that's fine. that's fine. >> people are telling me you're the shooter. >> that is a hell no. you know what? that night i was in watford city, north dakota. >> you went after him pretty hard, right? actually accused him of murder? >> i did. >> how did he respond to that? >> he denied it when and didn't >> i did not think he was the guy. >> so why'd you do that? >> sometimes you do things, try to pressure people or put them under pressure to see their reaction or -- and he did not flinch. >> reporter: the detectives asked delayo to take a polygraph, and he did. >> did he pass the test? >> yes, he did. >> reporter: so, curious, certainly, but a real lead or a dead end. hard to know. investigators kept working other leads, and christmas happened. sort of. >> it was really a rough christmas. i look back on pictures, we had smiles on