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And they found his dna under that nail and on the cord she was strangled with. >> 100 parse match. 100% match. >> so now detective davis played his hand. >> i think you were there when this went down. and i think you had something to do with it. >> reporter: and matt exploded, a stream of loud and determined denials. >> i didn't kill her. i don't know who did it. i wasn't [ bleep ] there that night. i wouldn't be able to watch my uncle harry basically collapse over the body of his daughter at the funeral if i had done this. somebody's murdered my friend, and here you are trying to accuse me of...

>> reporter: he tried. but even at jessyka's funeral her son, then just 6 years old, didn't seem to comprehend. what was that like for you? >> it was horrible, especially with her being right there, and he still wasn't comprehending that she -- that she wasn't with us anymore. >> reporter: that was when the detectives were tracking down -- well, they didn't know who. the sister's ex, the guy who'd been charged with assault, had a solid alibi. but what about the men who'd attended jessyka's small parties? one party in particular. >> one of her friends invited her boyfriend. her boyfriend invite...