so jason autry is their best hope at a conviction. >> when jason autry came along, it's what the stateonviction of somebody, and i think the state really needed to convict somebody. >> reporter: for years, jason autry had been proclaiming his innocence to anyone who'd listen. >> i want to say one thing, i'm innocent of these charges. right hand before god, i'm innocent sir. >> reporter: but this time with his right hand before god, it's a different story. >> right there is the location where she was killed. >> he said the morning she was taken zack adams asked him to get rid of a dead body in the back of his pickup truck. >> he said i need you to help me bury this body. >> reporter: he says according to zach adams the body in the blanket was holly bobo. autry says he and zach drove the body down back country roads to a spot on the tennessee river under the interstate 40 bridge. cell phone records show they were both in that area that morning and this graffiti suggests zach had been there before. he says they laid the body in the blanket on the ground. >> at that time i see the foot mov