as petrey began poring through the file, he came across a name, tammy singleton. e fbi. >> really small town, everybody knew everybody. >> back in 1982, 12 years before shannon's disappearance, tammy was 14 years old and living with her family in neponset, illinois. one day she got a call from the brother of her ex-boyfriend. the brother was 22 years old, already married. he asked tammy to get together, and she agreed to meet him on her way to a slumber party. >> i'm waiting around with my overnight bag, and he finally pulls in, doesn't see me initially, then does. >> she expected her ex, tim, to be there, too, but he wasn't. still, she knew the brother as the son of her one-time pastor. so when he asked her to get in his car, she did. >> and he said he had something from tim for me. and it was a ring that he tried on my fingers and placed on my pinkie. and then he tied my -- asked me to clasp my hands together and tied my hands behind my back. i'm still not registering. >> tammy, tammy, what's going on here? >> i'm not registering that it's a problem until i feel