Steve Foley writes:

Please tell me EXACTLY what kind of event made this pilot too ill to fly,
and what kind of test is commonly used to detect this event.

The most recent report on the event speculated that he had a heart
attack, exactly the kind of event that the first-class medical is
designed to preclude. That's supposedly why the FAA is paranoid about
things like hypertension.

In reality, heart attacks are much more difficult to predict, and
judging by statistics for auto accidents, heart attacks while
operating vehicles are rare, even for people at risk.

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