I only read about Scalia’s death today.
No, the title question was not rhetorical, and no, I do not know the answer to the question of his sudden death…

It’s unclear whether Judge Guevara’s statement will put concerns about potential foul play to rest.
Even as the cause of death was being announced, a report that the justice was found with a “pillow over his head” was published, citing the eyewitness account of the man who’d hosted Justice Scalia at the ranch where he died.

…As late as Sunday afternoon, there were conflicting reports about whether an autopsy would be performed, though officials later said Scalia’s body was being embalmed and there would be no autopsy. One report, by WFAA-TV in Dallas, said the death certificate would show the cause of the death was a heart attack.