It's sad but also not sad
because of the Alzheimer's.
As it turned out, he never lost his marbles entirely and he didn't end up in a depressing hotel in Switzerland, far from a home that denies people their final release from pain and misery. He died in his own bed, with his family on a pleasant-ish* spring day in Wiltshire.
That's called "winning".
* ie - perfect for Terry.