Who called 911? When? How long had he been under coronary stress? Is there a security video of his walking past something? Was he going to meet someone? Where was his family? What had he done yesterday? If he had heart problems, was he on medication? Which, if so? Had he had a stent or something?
He collapsed on the street? Where? Why was he there? What/who is near his home?
Given the number of enemies he had, I hope they are treating this as a possible homicide, although the immediate claim that he died of “natural causes” makes it seem that’s not the case...
Unless the people close to him are supposed to claim it’s natural causes while police investigate...