The bottom line is that regardless of whether natural or unnatural causes are to blame, if unnatural and done right, it cannot be detected much less correctly attributed to a guilty party. In either case, had the coroner got off his dead ass the door would not have been left standing wide open for the circus that is virtually guaranteed to follow.
If an unnatural death cannot be detected, what good is the coroner's word? That's all the clowns need. The circus will go on, regardless.