That's the trouble with cardiovascular disease (some kinds, anyway) -- you can look healthy as a horse and do everything "right," and still have something like this happen to you.
A good friend (a 48-year-old guy) just experienced something similar. He's a fit, non-smoker, exerciser with low cholesterol who eats right -- and yet he suddenly showed up at the emergency room with chest pain, where the medicos discovered he had 99% blockage in his "widowmaker," the left main descending coronary artery. Turns out, this problem runs in his family. His dad died in his 50s, and his brother who's 42 just had a heart attack. The good news is my friend got it repaired with a stent and now feels like he's "... in high school" because his heart is now getting sufficient oxygen and nutrition for the first time in years.
There are other life-threatening cardiovascular problems that aren't "heart" related -- like abdominal aortic aneurysms. Ouch! You don't want one of those. My husband had one, which happily we found out about before it exploded -- a brilliant radiologist saw something unusual on an x-ray of my husband's back ordered by a chiropractor.
We should indeed take good care of the body we were given. But life, disease and death is often just the luck of the draw.
Shit happens. And nobody ever gets out of here alive.
So buy the house a round!
TG1
P.S. R.I.P., Joe Feschbach. I didn't know you. But I hope, as the saying goes, you're in a better place.