what's the moorers might have needed to kill heather and dispose of her body. how hard was it for you, being in that courtroom every day hearing those details, having to see tammy? >> most days when i woke up i didn't want to come to the trial but i went because, when you see your parents hurting, you wish that you could take all their pain away. and something like this, it's impossible to ask me to do, but you can do small things. you can sit with them. and you can hold their hands when they need it. >> after seven days of testimony, the prosecution rested. and the defense announced tammy was going to testify in her defense. as hard as it might be to listen to her, that was something morgan didn't want to miss. >> coming up. >> did you kidnap heather elvis? >> no, i did not. >> tammy moorer on the stand and on the offensive. >> tammy was just indignant. >> there is answers to this mystery and they refused to solve it. >> when "dateline" continues. with type 2 diabetes you have up to 4 times greater risk of stroke, heart attack, or death. even at your a1c goal,