[maryz]

that “suicide” has to be marked with a permanent question mark.

From what I've read numerous times over the years, women typically don't choose violent or potentially disfiguring methods of suicide. They favor poison or the ever popular alcohol-and-pills. Everything about this is just begging for further investigation.

[bvw]

Means, motive, opportunity.

As you say the means -- that is the form of the death -- is suspect. And it is clear that while she did have motive for suicide, others also had motive for her murder. So that leaves opportunity -- have the investigators pursued that?

Probably not.