Sorry to hear that. But a friend who may have the most acute ear of anyone I know heard Lee in Chicago recently and was very impressed.
I felt in the presence of a "legend", but there was no stamina & the "singing" on every song was distracting.
He kept looking at his watch, asked how long are we supposed to play & was finished in less than 45 minutes. There was no 2nd set.
That was my feeling as well when I caught him a few months ago. Although Lee's scatting wasn't nearly as distracting as Dan Tepfer's over the top Keith-style body gyrations while playing scales.