Shagnasty’s clearly sincere views, and his apparent lay understanding of legal issues, may have been unpersuasive to many, not because his primary thesis is wrong, but because it was overlaid with opinions that clearly were a consequence of his (perhaps justified) own views on issues.
Here is a copy of the intermediate Court of Appeal decision that affirmed the first conviction. I have yet to find the Supreme Court of Texas decision, but the decision I have attached explains the issues and the facts.
TLDR is that the court considered that the bare circumstantial evidence was not by itself sufficient to sustain a conviction (the rag, the holes, the insurance, etc) but that the expert evidence that indicated that the deceased son must have been moved after death (obviously impossible on Payne’s account) together with the circumstantial evidence, was.
The evidence of moving the body arose in two ways. First, there was stippling on the body of the son (from discharge residue) that suggested a narrow range of distance from the muzzle to the site of the stippling from which the weapon must have been discharged. There was then some conflicting evidence about whether it was possible to manipulate the weapon into the necessary position to achieve this. The best the defence could advance was an unlikely scenario involving using hs feet to prop the gun against the floor and his toes to operate both the safety and the trigger. I suggest this is unlikely (that is not a specific conclusion by the Court) because it is necessary to resort to this because of the stippling. The question arises, why would the son go to such awkward lengths to shoot himself when it would have been so much easier (and more common) for him to have pressed the muzzle against his head and discharged the weapon with his hands?
The second body of evidence about moving the corpse of the deceased was said to emerge from finding of the son’s own blood on the palm of his hand. The presentation of this was not consistent with mere post-mortem flow given the arrangement of the body. It indicated that the body had been moved.
I make the obvious point that where there is a clash of experts, there is no rule that the jury must follow the expert most favourable to the defence. Much depends on the content of the evidence itself, and it is typically for a jury to resolve who is right.
It would seem the case is perhaps stronger than shagnasty seems to think, with genuine respect to him as a long term member of the boards. That does not mean that it was a slam dunk for the state, but it does mean that there was more to this than small town juries and allegedly influential relatives.
I appreciate that there has been a subsequent ruling in the Texas Supreme Court, but again that court concluded that there was a basis to convict.
In the absence of the evidence at the most recent trial, I will withhold any final view about whether the evidence was sufficient, but I hope this advances the debate somewhat.