The world is paying tribute to British actor Alan Rickman who died Thursday at 69, best known for his roles as Severus Snape in Harry Potter movies, Hans Gruber in Die Hard and the Sheriff Of Nottingham in Robin Hood: Prince of Thieves.

Harry Potter author J.K. Rowling was among those who expressed their grief on social media ... 

As did Harry Potter star Daniel Radcliffe ...

And fellow castmates Bonnie Wright (aka Ginny Weasley) ...

Warwick Davis (who played Filius Flitwick) ...

Stan Yanevski (who played Viktor Krum) ...

Chris Rankin  (who played Percy Weasley) ...

And James and Oliver Phelps (who played The Weasley twins).

English actor Stephen Fry, who read all seven of the Harry Potter books for audiobook recordings, also took to Twitter.

Other celebrities shared their sorrow on Twitter.

Many noted Rickman's death followed just days after David Bowie, who also died aged 69 after secretly fighting cancer.