Did you ever get any insight from your doctors as to why it might have happened? High cholesterol? Family history? Sorry to hear that.

No I have zero chronic conditions, no auto-immune disorders that might cause issues with clotting, family history and so on. Basically from a root cause perspective it's unexplained.

So sorry to hear that. Did you experience any warning signs before, like mild chest pains, palpitations, or shortness of breath, that day or in the weeks prior? Also, were you pushing yourself on that day compared to other days of your week, or did it just come out of nowhere at an average pace day?

I had chest pain a few days before and was getting over a cold but otherwise no.