https://www.cnet.com/news/mark-hamill-calls-carrie-fishers-appearance-in-star-wars-9-bittersweet/

"It's bittersweet facing my final chapter without her; she is simply irreplaceable," Hamill tweeted on Sunday. "I'm finding solace in the fact that she won't be replaced & would love the worldwide outpouring of affection from those who loved her when they heard the news. #CarrieOnForever."

Hamill and Fisher have been portraying the iconic brother and sister duo Luke Skywalker and Leia Organa ever since Star Wars: A New Hope debuted in 1977.