At one point in my career, I was knowledgeable about sudden cardiac death in athletes (it’s a thing). My angle was, “what testing can/should be done to identify potential sudden death in young athletes?” - and the answer then, as now, is “nothing”.
In the 1970s, when I was still doing that stuff, the most common thing a relative of a sudden cardiac death victim would say was, “But he just had a checkup!”
Lots of athletes who die suddenly have hypertrophic cardiomyopathy and abnormal EKGs, but most athletes with those things don’t die.
The younger brother passed about 3 years after the older one, doing the same competition. We knew the parents, and they had talked about what a hard decision it was to have the younger one follow the same path. After the 2nd boy passed, the parents moved away and did not keep in contact with anybody in town.