"I think he was in one of his feeding binges, he was having a tantrum, and he was unsupervised for a brief period of time, and I believe that he ingested a large amount of salt."
Moritz has written extensively about salt poisoning and its connection to pica.
"When I pulled all the cases of salt poisoning, they all fit the same profile," he said. "Children within that age group of two to six years of age, in foster care from abusive homes but with behavioral problems, who had history of pica, who by all accounts appeared to have voluntary ingested large amounts of sodium."
For his part, Moritz doesn't believe Hannah Overton knew Andrew was dying.
"I think most people would never suspect salt poisoning, since it's something very few pediatricians or emergency rooms in the country have ever encountered," he said.
Larry Overton also faced a charge of capital murder, but pleaded no contest to negligent homicide in return for five years' probation.
"For me, having the chance of spending some time in jail and leaving my kids without parents was not something that I was willing to do," he said.
By pleading no contest, Larry did not have to admit guilt. "I wasn't going to plea to a deal and say I committed or did something I did not do," he said. After two years, Larry can go in front of a judge and ask to have it expunged from his record.
Since Hannah Overton's trial concluded, Larry Overton has been a single father of five. Once a month, he packs them into the family van and heads north. It's a 300-mile drive, but no one complains, because for two hours the Overton children visit their mom at a Texas prison, where she hopes her case will be overturned.
Still, Hannah Overton says she doesn't regret trying to adopt Andrew.
"I wouldn't take that away," she said. "He had brothers and sisters and a mommy and daddy, what he called his forever family, because we had to go through a lot of pain since then. It's not fair to him. Or to us."