we found a torn up letter that was his words to lottie spencer. r's torn up letter to lottie was hateful and threatening. prosecutor jesse evans. >> he specifically talks about having plans and backup plans to exact revenge on lottie and the worst part about the letter is, he gets to the end and he says, but i'm going to let you live. i'm going to get revenge on you but i'm going to let you live. >> to police and prosecutors, this wasn't just a rant, it looked like a blueprint for murder. now they tried to link daker to the crime scene. >> some of the important evidence we start with is the hair and fiber evidence that was recovered off of carmen smith's body. there was a broken knife blade. >> carmen had small puncture wounds on her back and terrible bruising suggesting a ferocious struggle. >> she had been not only tortured and murdered but she had been undressed at some point and redressed. >> at carmen's bedside, the hammer she had wanted for peace of mind. never touched as she fought for her life. not far away was the suspected murder weapon,