I’ve seen several videos of soccer players dropping dead on the pitch.
I always remember as a kid the day that Chuck Hughes, the Lions WR dropped dead on the field, that memory still haunts me.
And Hank Gaithers also comes to mind. Although IIRC Gaithers stopped taking his meds, which probably contributed to his death.
In almost all of those cases it was a heart-defect they were born with, and there was nothing they could do.
I remember Gathers very well. I was a Senior that year. I remember Bo Kimble with the lefty free throw...
Chuck Hughes died after catching a pass and being absolutely leveled by Dick Butkus in the most vicious hit I have ever seen. He died on the next play I think.