Define natural causes with a little more detail by an autopsy by a doctor.
Natural causes = shot three times in the back of the head
Among many things my own father told me years ago, comes to mind now; that a county coroner's office should always be separate from a sheriff or city chief of police.
Better the extra costs, and yet another political office which can at worst contribute to shenanigans, than for those with the power to kill, to have power to easily cover it up.
We see in the original incident, the death of the woman, shot by the seeming badge-heavy LEO, an early turning away, and lack of support for that officer's actions by his own Department... so in regards to the woman's surviving husband's now recent death, I'd just as soon "trust" but still be able to "verify".
Such a (political) condition would be helpful to LEO organizations, in the long run.
It's funny though...every time I've mentioned the need to sheriffs or chiefs whom did not have a separate coroner's office, they always argued strongly against it, going so far as to keep fishing in the conversation long enough for mention of deliberate misdeeds and cover-ups that HAVE occurred at times & places in our nation, to inevitably surface. Most other natiosn or peoples under any form of government or power, has had a taste of government misuse of power along these lines, off-and-on throughout history. Of course when the conversation would get to that point they'd become offended (as I could easily enough foretell during those conversations was the aim or intent) and begin to paint me as the bad guy. Ok, it happened twice. That made me begin to see a pattern. They don't want the idea talked about. Riase the issue = face opposition, including stealthy but in-your-face ad hominem.
As soon as certain lines of challenge & questioning (by those in power) gets rolling, expect the results I've outlined. Which of course always makes me wonder...what are they hoping (or trying?) to hide?
In the instance of the widower, if not dying of natural causes, then what motivation could there by remote chance be, other than possibly some frustrated LEO not wanting anyone to benefit at a fellow LEO's further embarrassment, for it tarnishes other LEO's, too, both rightly, & apparently in the instance of the woman's death itself, quite wrongly, for no other officers were involved in that shooting, and AFAIK none tried to cover it up.
It would be difficult to imagine someone doing it just to save their own retirement bennies, but when push comes to shove along those lines, then that can be a powerful motivator, too. Municipal funds are tight nowadays.
But like I said or meant to say...I have no real reason to leap towards further mistrust, yet it would be nice to have those sort of concerns openly & honestly put to rest (by a fully independent, elected coroner) with the evidence open to public inquiry, just so folks can get into the habit of "looking over shoulders" and checking.
Hey, they "check" up on the rest of us, some reciprication is not only in order, but can build trust, as long as everyone, including the inquirers on either or both sides, is honest.