A few years ago SFO - ORD, a fellow had a crisis of some kind. Don't know if it was a heart attack.
We diverted to DEN. The pilot was obviously given priority landing 'cause he came straight in with an unusually rapid descent and approach.
The medics attended the fellow on the plane, then removed him.
The FA's did look shaken - not so unusual for the adrenaline to have after effects.
After a long delay in DEN - storms had developed over the Midwest, and we lost our slot to continue, off we went.