every piece of evidence is definitely important. reporter: not that corporal and ellis thought for a second that they were wrong, they believed dawn was the killer. they told the prosecutor not only that dawn murdered teresa but that they were convinced that she tried and failed to kill her with a xanax overdose at the casino. and the sheriff department believed that was an attempt on their life, that we had nothing really to support that. reporter: if tim evans was to get a conviction, he needed more evidence, some concrete proof that dawn had pulled that trigger. now, you can bet dawn wasn t about to tell them anything. but that doesn t mean she wasn t talking. we had another young lady that was getting out of jail and she came to us and said that dawn had been talking about the murder. reporter: but that could have been just gossip, mind you, from a jailhouse snitch who couldn t back it up. but dawn did have a clmate.