motive. >> i think i was like everybody else, a little incredulous that somebody would let the fact that they'd been blackballed from a fraternity fester for years and culminate in killing the person they blamed on blackballing them. >> mind you, they had a bit more than just aimee. they'd found what they believed was the murder weapon, a 243 weatherby rifle at shane's mother's house. and at his father's place they found.243-caliber bullets like these. an fbi expert said testing had linked those bullets to the fragments from the fatal bullet. the defense argued the tests were not reliable science. >> call your next witness. >> aimee lloyd. >> and now, nearly eight years after trent was killed, here was the one person who could tell the story. aimee lloyd finally revealed herself publicly. that seems fathers plays they found two caliber bullets like this. this