I think of Hank Geathers, but his condition had been diagnosed , and he had stopped taking his medication.
But sometimes you don’t know until it hits. Pistol Pete was born without a left ventricle, and they only found out after his autopsy, it was a miracle he even made it to 40.
it appears his covid was in october...so it could be remnants from that...as it causes inflammation and other issues that could be lurking