All died from a sudden aortic rupture with no warning.

For the first time a special type of MRI can detect the danger in advance:

https://medicalxpress.com/news/2023-12-unstable-fluttering-aortic-aneurysm-accuracy.html

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"Aortic aneurysms are colloquially referred to as 'silent killers' because they often go undetected until catastrophic dissection or rupture occurs," said Northwestern's Neelesh A. Patankar, senior author of the study. "The fundamental physics driving aneurysms has been unknown. As a result, there is no clinically approved protocol to predict them. Now, we have demonstrated the efficacy of a physics-based metric that helps predict future growth. This could be transformational in predicting cardiac pathologies."
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An aortic aneurysm occurs when the aorta (the largest artery in the human body) swells to greater than 1.5 times its original size. As it grows, the aorta's wall weakens. Eventually, the wall becomes so weak that it can no longer withstand the pressure of blood flowing through it, causing the aorta to rupture. Although rare, an aortic rupture is usually unpredictable and almost always fatal.
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"If it ruptures when the person is outside of a hospital, the death rate is close to 100%," Zhao added. "The blood supply to the body stops, so critical organs like the brain can no longer function."
...snip...
Surprisingly, the researchers discovered that instability tends to arise when the wall is more flexible. This finding directly contradicts common knowledge that aortic stiffness is a sign of disease.

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I have had two friends suddenly die of aortic rupture who seemed to be
just not good,
but in “high energy and good health.”