It's probably worth remembering that there is a tremendous amount of political pressure on the coroner and prosecutors dealing with this to not leave behind an

It's probably worth remembering that there is a tremendous amount of political pressure on the coroner and prosecutors dealing with this to not leave behind an unsolved murder finding that could sully the reputation of the entire system for giving congress a chance of hearing testimony from whistleblowers. So anything short off enough evidence to secure an quick conviction of some disposable culprit will we bend into whatever shape is needed to support an "suicide" or "accidental death" finding by the prosecutor/coroner in charge regardless of what the investigating detective think is the most likely explanation.