Thanks for the update. What a story - odder every day. I think there is more to the story. What is the connection of DH to this family? (I'm NOT saying DH is behind the killing.) Was this motivated by revenge? Is this family connected to someone else (for example, the Lynch fellow)? A "rage" killing over credit card fraud is a bit over the top. Also, the carving on the back is odd if this killing simply occurred due to the fact that she caught him in the mail box. Usually, the "initiation" killings are planned for that purpose, they're not an afterthought. I wonder if he was on meth at the time of the killing.
I agree that there has got to be more to this story. Hitting someone 39 times with crown molding, etching a Lorraine cross in her back, drinking a glass of water at her home, taking a long shower at her home, trying to get massive amounts of blood out of your clothing with Oxyclean, etc. because someone might have received your pot-growing lights and didn't give them to you is a bit over-the-top.