fassbender said that dassey described a brutal scene.on that halloween afternoon, his uncle asked him to come over to his trailer. dempsey said that they each sexually assaulted teresa in avery's bedroom, and avery later shot her in her's garage burning the body in the bonfire. >> it is a game-changer. the stuff that we were not really where, of like teresa was shot in the garage. >> after speaking with dassey, fassbender at his team returned to every property once more and they found this in his garage. it bullet fragment. >> that was missed the first time around? >> you could say who's missed. you're talking about a 22 bullet fragment, it looks like a piece of dirt. her dna was on that bullet. >> do you now believe that teresa was shot in that garage? >> yes. >> one strange thing, though, was when they searched the garage for blood, they never found a blood. >> how could you clean up all that blood? >> bleach, paint thinner, it cleans up blood. >> teresa's friend can said that when she heard the details about teresa's final moments, sh