sounded for all the world like she was boasting as she confessed to her cellmate that she murdered teresa mayfieldod. in fact, in recorded conversations with her cellmate, dawn not only admitted to shooting teresa, but said that she had tried once before. that strange night at the casino when teresa came home stumbling, that was her first attempt at murder. >> why would she want to kill her friend? because, listen to this, the whole answer to the whole puzzle comes down to one little word. dawn uses it when telling her cellmate what she did. we? she was not acting alone, she had-conspirator. >> i don't know if she was trying to be a show off, because she was calling herself a hit man. >> dawn was a hired gun for -- you guessed it. scott mayfield. >> she was a loving wife, loving mother. >> the man who heaped praise on his dead wife, his grieving children by his side was according to dawn the architect who designed her death, her revelation finally made sense of a trail of disturbing stories the investigators had been running down for months. >> we had one guy that worked around there in moundville