Imagine the following scenario: On the 9th of January 2024 in the morning we wake up to news that President of the USA Joe Biden suffered a stroke and died in White House. The administration confirms that the death was entirely natural and no third party contributed to it. Even before the news reach all TV stations another one breaks: Former president of the USA Donald Trump has suffered a cardiac arrest and died in his residence in Mar a Lago. Early reports claim that the site was secure and no malicious actor could reasonably reach Mr. Trump so the death is most likely natural.
What happens then?
Honestly, I think if Trump died instantaneous there would be a massive movement claiming that the current Administration was the cause of death and they would use the most recent judicial hearing regarding Seal Team 6 as evidence towards it. There would be no proof of anything because like you said it was a natural death but that would not be enough to prove anything and I believe there would still be riots
As for if the president dropped dead, the vice president would take over and there would likely be an investigation into an assassination attempt but I don’t think anything would come out of it because like mentioned it would be a natural death.