see, if you need to keep a secret, especially, for example, if your secret is about murder. to begin with, this thoughtful young woman was just a girl of 17 back in '07 when it things started coming apart in the way things do when parents don't talk about it. kelsey mayfield saw that troubled look in her home's eyes, her mother teresa. >> i could tell she was just very stressed. >> everclear to you what she was stressed about? >> money would be the main thing. she just wanted to make sure she had enough money to take care of her family. >> kelsey's dad had to work two job, neither of which paid very well, just to keep his head above water. >> very hardworking man. it took two jobs to take care of our family. >> but money trouble aside, teresa seemed to have a happy life as anybody could see, including teresa's mother, reba.