before he can testify, shayne austin hangs himself in a florida hotel room.es desperately need a break. there is no physical evidence linking the adams brothers or jason autry to the crime. even so, prosecutors charge all of them, including dylan, announcing they'll seek the death penalty. all three plead not guilty. and this guy actually believes them, the former agent in charge of the early years of the investigation, terry dicus. why don't you think these young men are guilty? >> i don't think they're capable of doin' arithmetic, much less this. >> reporter: but prosecutors are confident they can make it all add up. still ahead, the trial that rocked decatur county, a best friend's betrayal and chilling story about what happened to holly. >> boom. boom. boom. >> reporter: stay with us. ancestrydna can reveal where in the world you're from. and with 5x more detail, it can lead you on an unexpected journey... ...that brings you closer to home. for just a few days, it's only $59 to discover your heritage. so instead of telling stories of where you went... ...