how did immanuel kant died?

Answer 1

He died at the age of 80 in his home town of Konigsberg (he actually never in his life travelled more than forty miles from this town). It was at the end of a rather long and steady decline: he had stopped lecturing eight years before (his hearing was getting bad), and couldn't even write for the last four years (his sight started failing). There's reason to believe, from his symptoms, that he suffered from Alzheimer's - toward the end he has frequent short-term memory loss and was unable to recognize even friends and relatives. Lack of income saw him die as a poor man, but even so the entire city took part in his funeral. Thousands of people joined in the march and he was entombed in an honored spot in the cathedral.

Answer 2

Koenigsburgitis

Answer 3

He died of a lingering illness. I don't remember if it was anything specific. He was in poor health for a long while, and then just sort of abruptly got much worse.