How do you figure this is suspicious circumstances? The pathology seems pretty reasonable, he got sick, developed pneumonia & MRSA, and ultimately suffered a stroke. It's not like he had radiation poisoning.
It's suspicious in that foul play can not be easily ruled out. It is plausible that someone could be deliberately infected with an infectious disease that has high odds of killing someone quickly. Conversely it's not plausible to say make a hurricane strike someone's house.
And again, this is all with the context of another suspicious death - gunshot wound to the head. Again, suspicious because foul play is plausible, not because there are no other reasonable explanations.
If someone died of something for which there was no reasonable explanation besides foul play, such as radiation poisoning, that would be referred to as evidence.
