That's very sad keberoxu. My own father is another example. He played tennis and badminton for his teams after retirement, and swam lots of lengths of the pool twice a week. Never smoked. Drank only a small glass of wine occasionally with his dinner. Wasn't an ounce overweight, ate extremely healthily.
But sadly his neighbours and the Police discovered his body in his bed after they noticed he'd left gardening equipment out on the lawn for a few days.
It was terribly sad, and the post-mortem revealed a cardiac infarction.
He was 76, which isn't all that old nowadays.
When I rang all his friends, they just couldn't believe it. They all said how fit he'd looked.