I have a strong dislike of Richard Mellon Scaife and his influence on politics. But if I were a wicked billionaire who wished a bad end on a troublesome gadfly, why would I have that person assassinated in the bathroom outside my office, as opposed to knocked out, smuggled out via the freight elevator, and done to death in some deserted spot? If the goal is to demonstrate impunity of some sort, why not just have him thrown off the roof of the building?

Here, we have to posit a conspiracy powerful and cold-blooded enough to commit and cover up murder, but which is too inept to to put any significant distance between (presumed) co-conspirator and victim. I think we need to give equal consideration to the possibility of it being a 'doorstep suicide,' where a troubled person ends their life in proximity and as a reproach to a perceived antagonist, if only because of Occam's Razor.