Sources:
https://www.cnn.com/2018/11/12/entertainment/stan-lee-obit/index.html
https://www.nytimes.com/2018/11/12/obituaries/stan-lee-dead.html
https://www.washingtonpost.com/local/obituaries/stan-lee-creator-of-superheros-dies-at-95/2018/11/12/0ca938da-e6ac-11e8-a939-9469f1166f9d_story.html?noredirect=on&utm_term=.2f73c251129f
https://www.npr.org/2018/11/12/106322838/a-marvel-of-a-man-stan-lee-dead-at-95
Stan Lee's Wikipedia page: https://en.wikipedia.org/wiki/Stan_Lee
And there you have it folks... No more Stan Lee cameo appearances from now on in Marvel superhero movies :/
RIP Stan. Your legacy will carry on...