a backyard halloween bash in 2015. july 2016, 21 months and 1,037 tips after the untimely death of chelsea bruck. detective mike preadmore confronted daniel clay, the ladies'man whose dna was on chelsea bruck's halloween costume. >> you never had sex with chelsea at the party? >> no. >> before the party, after the party? >> nothing. i didn't even know her. >> like a patient fisherman, the detective flicked lures around his suspect. >> you're a lucky man. i wish girls just -- >> be confident. just talk to them. >> i think i'm a pretty confident kind of guy. >> do you have a wife? >> i do have a wife. that's probably the problem. >> so it went. until, calmly and quietly, the detective broke the bad news. for all of daniel's denials, dna doesn't lie. and his dna was on chelsea's costume. and so the question -- how could that be? >> i did not do anything to that girl. i did not. i'm telling you. >> he was adamant.