This may all come down to a horrendous death as a result of reckless endangerment. What pegs the BS Meter straight to BOGUS is that every time the APD drips out another nugget of detail, another spin story appears from the attorney-husband.
Now the radio news report has him self-diagnosing being in PTSD as a result of his poor weapon handling, according to a family spokesperson.
My BS meter pegs out every time a spouse is shot "while I was just cleaning my gun". This shooting is in the same category of events, where it might true, maybe, but there is a far more plausible alternative explanation for a man shooting his wife in the back. The evolution of the excuse just adds to that impression. Perhaps he's innocent, and having seen very little of the evidence I certainly have some doubt. However, it would take a whole lot to raise that sliver of doubt to the level of "reasonable doubt".