for 2 1/2 hours. >> reporter: a grand jury charged both hannah and larry overton with killing andrew burd, capital murder, an automatic life sentence in texas because andrew was under the age of 6. but the overton's church community, led by pastor rod carver and his wife noreen, saw the accusations as ludicrous. the church even raised $700,000 for their defense. >> it's so bizarre because she's really the last person you would think would be charged with this type of crime. >> reporter: while hannah and larry awaited separate trials, hannah gave birth to a baby girl, emma. but child welfare placed all five children with loved ones, allowing the couple only supervised visits. from day one of hannah's trial, prosecutors attacked hannah's seemingly calm, motherly demeanor and made her out to be an abusive monster. >> a comment someone made was that it appeared that this child had been in a fight with a porcupine. >> i remember some kind of injury that was there, either bruising on the elbows or knees. >> reporter: and there was more damning testimony. this time from andrew's foster mothe

at the time, hannah and larry overton, former missionaries, had four biological children all under the even as thhannah was expecting fifth child, they volunteered as foster parents. >> it was exciting to give that love to somebody who needed it. >> reporter: within a few weeks of moving in, hannah and larry began to see odd behavior. >> i started noticing that he was hording food. anything that he found, he would put in his mouth. he ate dog food, cat food. >> reporter: it only got worse. obsessing eating. excessive tantrums. just four months after andrew moved in, another unusual tan trem. >> he was throwing a fit for quite awhile and then he threw up. >> reporter: when the 4-year-old complained of being cold and started shaking, hannah says she and her husband suspected the flu. when his condition got worse, they raced him to the hospital. >> within yards of the urgent car saecenter, he stopped breathing. >> reporter: andrew had salt poisoning, with a sodium level almost double the norm. >> i've never seen sodium that high in anyone. if you take salt at a level faster than your body