How and when did Nicholas Winton die?

Answer 1

He is still alive, aged 101. Please see link.

Answer 2

Nicholas Winton, a humanitarian who saved the lives of over 650 Jewish children during the Holocaust, died on July 1, 2015, at the age of 106. He passed away peacefully in his sleep at his home in Maidenhead, England. His heroic efforts were not widely known until the late 1980s when his wife discovered documents detailing his rescue mission in their attic.