"She is simply irreplaceable", he wrote.
Hamill also said Fisher "would love the worldwide outpouring of affection" that greeted the news she would appear in Episode IX.
"We desperately loved Carrie Fisher", said J.J. Abrams, who is back at the helm for "Episode IX", having directed "Episode VII: The Force Awakens" in 2015. This was reinforced by a statement a month after her death from Lucasfilm that her character would never be recreated digitally, like they did with the late Peter Cushing for his character in Rogue One: A Star Wars Story.
Hamill, who will reprise the role of Luke Skywalker in the film, posted a moving tweet regarding his friend and co-star, in which he described the experience of appearing in a Star Wars movie without Carrie as "bittersweet". If you watched The Last Jedi, you may have even teared up thinking this is the last time you will see Carrie as Princess Leia. He also confirmed that he and Billy Dee Williams will be in the upcoming installment. New actors joining the cast of Episode IX include Naomi Ackie, Richard E. Grant, and Keri Russell.
Carrie Fisher's tragic demise in 2016 seemed like it would mean the end of the road for Leia Organa two years before Episode IX was scheduled to begin filming.
Mark Hamill has broken his silence on the use of old footage of Carrie Fisher in Star Wars IX.
Daisy Ridley, Adam Driver, John Boyega, Oscar Isaac, Lupita Nyong'o, Domhnall Gleeson, Kelly Marie Tran, Joonas Suotamo, Mark Hamill, Anthony Daniels and Billie Lourd return for the film. Legendary composer John Williams, who has been involved in every Star Wars film, will also return.
Hit Next to discover the five best and five worst things about Solo: A Star Wars Story! .
Happy with the results: 'Finding a truly satisfying conclusion to the Skywalker saga without her eluded us.