As usual correlation don't imply causation. My uncle was a professional national level runner, he was the healtier person that I know: he ran several kilometers every day, ate correctly, no drinking, no smoking, sleep at least 8 hours/day, etc. He died from cardiovascular problems. This not means that a correct and healty lifestyle is not going to reduce the risk, but it's not the only factor.
I am sorry for your loss. But I am curious what "ate correctly" meant for him. Would you be kind enough to provide some details?
It seems people are really sure that exercising a lot and not eating meat or whatever is the healthiest thing one can do, for weight and health reasons... But evidence says the complete opposite, most of the time.
People are so fascinated about the idea that exercise and certain foods are so good, that they don't even bother to check the studies and the evidence, they just know it's true for some reason. It doesn't matter that everyone you know is going to a gym or running (a million more times than, say, 50 years ago) and yet the populations are only getting more obese by the minute. Or how athletes are dying young and have many health issues everywhere... Or that indigenous people don't even hunt or do nothing at all for a week (between each hunting trip), and yet they are so thin and don't have cancer.
In other words, no one really knows yet if running several kilometers every day is good for you, or if it's actually killing you. And no one knows yet what exactly is "to eat correctly", though I'm pretty sure all the stuff we've read in those paid studies made in the last 100 years are just absolute garbage.