Not that I knew of, but I know people can change over the years. I would lean towards this being a bad reaction to drugs, as far as the July 20th 'episode'. And they wouldn't be meeting someone that deep in the woods to make a drug transaction. These are the small towns Arkansas...there's plenty of places to do transactions without having to drive off the beaten path.
My personal opinion, and i'm trying to keep an unbiased opinion, is that she will go down for it. Something could have happened to the baby (even by accident) prior to them even going into the woods. They freaked and decided to dump the body and in the process she killed him. I would say they were both dead Friday for sure. If they stayed alive for several days then a crying baby would have been heard. And if Brian (a woodsman) would have stayed alive and able to move (and it was a kidnapping case) then he would have traveled deeper into the woods on foot. If the crime labs are half as good as they are all these TV shows then they should be able to find the cause of death. But I'm leaning towards foul play from the wife. Having a husband that has bad drug episodes is a motive. I don't know why she would kill her own baby though (hence my scenario of an accident).