"Harry Potter" and "Die Hard" actor Alan Rickman has died at the age of 69, his rep confirmed to ABC News.
The death came as a shock to many, who took to Twitter and social media to pay their respects to the acclaimed star.
Actress Emma Thompson, who co-starred with Rickman in "Love Actually," among other projects, released a heartfelt statement about her "ultimate ally."
"Alan was my friend and so this is hard to write because I have just kissed him goodbye," Thompson wrote. "What I remember most in this moment of painful leave-taking is his humor, intelligence, wisdom and kindness. His capacity to fell you with a look or lift you with a word. The intransigence which made him the great artist he was—his ineffable and cynical wit, the clarity with which he saw most things, including me, and the fact that he never spared me the view. I learned a lot from him," she said.
"He was the finest of actors and directors. I couldn’t wait to see what he was going to do with his face next," Thompson continued. "I consider myself hugely privileged to have worked with him so many times and to have been directed by him. He was the ultimate ally. In life, art and politics. I trusted him absolutely. He was, above all things, a rare and unique human being and we shall not see his like again."
Some of Rickman's other co-stars reacted to the news on Twitter, including James and Oliver Phelps, who played Fred and George Weasley in the "Potter" series. Matthew Lewis, who played Neville Longbottom in the films, wrote that Rickman "inspired my career more than he ever knew and I'll miss him."
British celebrities such as Stephen Fry, Harry Styles and Boy George also took to social media to pay their respects.
Here is what other stars and organizations had to say about his death.
There are no words to express how shocked and devastated I am to hear of Alan Rickman's death. He was a magnificent actor & a wonderful man.— J.K. Rowling (@jk_rowling) January 14, 2016
My thoughts are with Rima and the rest of Alan's family. We have all lost a great talent. They have lost part of their hearts.— J.K. Rowling (@jk_rowling) January 14, 2016
I was at Leavesden Studios today when I heard the news. As I walked through the canteen I thought of Alan queuing up for his lunch with us mere mortals. I recalled the trailer in which he offered me some of the greatest advice I ever received about this mad profession we shared. Being back in those corridors made me remember a lot of things and I will treasure those memories all my life. He inspired my career more than he ever knew and I'll miss him.
What desperately sad news about Alan Rickman. A man of such talent, wicked charm & stunning screen & stage presence. He'll be sorely missed— Stephen Fry (@stephenfry) January 14, 2016
A true legend of stage and screen. Alan Rickman, RIP. pic.twitter.com/VbpSOi7e5X— National Theatre (@NationalTheatre) January 14, 2016
RIP Alan Rickman. He will forever be in our hearts. pic.twitter.com/oUXYo3qcwA— Playbill (@playbill) January 14, 2016
RIP Alan Rickman. So, so sad. Another loss of someone so talented. #RIP— Danny Miller (@DannyBMiller) January 14, 2016
RIP Alan Rickman. You'll be missed.— Harry Styles. (@vHarryStyIes) January 14, 2016
"If people want to know who I am, it is all in the work"- what magnificent work it is. Sorry and sad to hear about Alan Rickman's passing.— Sharon Rooney (@sharonrooney) January 14, 2016
Alan Rickman: A compassionate man and a protean actor who perfectly captured the foibles that define our humanity. pic.twitter.com/n3Jan8HPlr— British Humanists (@BHAhumanists) January 14, 2016
Shocked & sad to hear Alan Rickman has passed away. One of the nicest actors I've ever met.Thoughts and prayers with his family at this time— James Phelps (@James_Phelps) January 14, 2016
Terribly sad news about the passing of Alan Rickman. A funny and engaging person who put a shy young actor at ease when I was on HP.— Oliver Phelps (@OliverPhelps) January 14, 2016
Goodbye Alan Rickman. You were genius in Harry Potter.— Boy George (@BoyGeorge) January 14, 2016
Everyone who knew Alan Rickman- or worked with him or watched his brilliant performances, feels this awful loss pic.twitter.com/pKOxFYYMUM— mia farrow (@MiaFarrow) January 14, 2016
Alan Rickman you were a lovely soul and a brilliant actor. I am fortunate to have known you and will miss you with the world.— Connie Britton (@conniebritton) January 14, 2016