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>> i called my mom and she didn't answer. i pretty much knew in my heart that something was wrong. >> a mother vanished. >> i cried myself to sleep. it was awful realizing your worst nightmare had come true. >> a family anguished. >> she's gone. do you have any idea how hard that was? >> now, the questions begin in a southern gothic mystery. >> the case is puzzling. we did not really know what had happened. >> who would everett manage and you would have a murder in the family. >> soon there would be secrets. >> we were dealing with a person that was leading a double life. >> and one ...

>> with calculated cold precision dawn lavender lured teresa to that dirt road. she then shot her in the back of the head then steered her car into the brush hoping it would stay hidden for a while. >> you're going to have to lie on the stand. >> i know. i have to look just like poor lil' innocent dawnie. not the [ bleep ] cold-blooded killer that i am. >> cold-blooded killer. >> if you think about it, that's exactly right. >> yeah. it's terrible looking at it that way, though. >> but it's the [ bleep ] truth. >> it was all there. a prosecutor's dream confession. she even referred to herself a...

>> here's what dawn said about the morning teresa was killed. around 7:00 a.m. dawn called teresa with a lie to set the plan in motion. >> [ bleep ]. >> no more vacation days. i told her my car was dead. >> she claimed her car had broken down. could teresa pick her up. of course she said yes. finished drying her hair, got into her car. made a short drive to the dirt road and there standing alongside the road was dawn. >> how big was the gun? >> with calculated, cold precision, dawn lavender lured teresa mayfield to that dirt road. she then shot her in the back of the head and steered her car

>> with calculated, cold precision, dawn lavender lured teresa mayfield to that dirt road. she then shot her in the back of the head and steered her car into the brush hoping it would stay hidden for a while. >> you will have to lie on the stand. >> like poor little innocent dawnie. >> cold blooded killer. >> if you think about it, that's exactly right. >> yeah. >> terrible look at it that way, though. >> it was all there. a prosecutor's dream confession. she even referred to herself as a cold-blooded killer. but there was one question anyone with a beating heart wanted to ask. why? there just...

>> with calculated, cold precision, dawn lavender lured teresa to that dirt road, shot her in the back of the head and steered the truck to the brush hoping it would stay hidden for a while. >> it was all there. a prosecutor's dream confession. she even referred to herself as a cold-blooded killer. but there was one question anyone with a beating heart wanted to ask. why? there just had to be an answer. of that, they were sure, but would they ever get it out of her? >> why in the hell did you do it? coming up. >> at some point, she was