So what's your idea of the appropriate response?
Here are my thoughts:
Americans do not typically kill themselves in order to further someone else's political, financial, or legal goals.
The only question remaining is whether the suicide was really a murder (or somhow extorted - really unlikely, I think). This of course, needs to be investigated.
If it proves to be just a suicide, then it may be inconvenient to the investigation, but it certainly could not be labeled a "cover-up".
I'll stop screaming now.