The beloved actor, best known for playing Captain Jean-Luc Picard in Star Trek: The Next Generation and the telepathic mutant Professor X in the X-Men franchise, died at his Los Angeles home on Wednesday, 28 October, following what his family described as a "brief and poignant journey" with Alzheimer's disease and Lewy body dementia.
His appearance in Avengers: Doomsday, scheduled for release on 18 December 2026, will reunite audiences with one of his most celebrated screen characters.
Marvel Studios paid tribute to the actor following the announcement of his death.
The studio said: "All of us at Marvel Studios are deeply saddened by the passing of Sir Patrick Stewart. Sir Patrick brought Professor Charles Xavier to life with extraordinary grace, intelligence, and humanity, defining the character for generations of fans, from X-Men to Logan to Avengers: Doomsday."
It added: "He was a singular talent, a generous collaborator, and a true gentleman."
Stewart's death was announced in a statement published on his X account, confirming that he had been cared for by his wife, Sunny Ozell, 47, during his final days.
Stewart had already filmed his scenes for Avengers: Doomsday, which is set to bring together characters from across the Marvel Cinematic Universe, including figures associated with the X-Men films.
The role of Charles Xavier brought Stewart renewed international recognition after he had already become a household name through Star Trek: The Next Generation, which ran for seven seasons between 1987 and 1994.
He subsequently reprised Jean-Luc Picard in several films and the television series Star Trek: Picard, which concluded in 2023.
Stewart's career began in British theatre, where he became an established Shakespearean performer with the Royal Shakespeare Company before achieving international television and film success.
He was knighted by Queen Elizabeth II in 2010 for his services to drama.
Stewart also worked alongside his longtime friend Ian McKellen, 87, who played Magneto in the X-Men films.
McKellen had initially advised Patrick against accepting the role of Picard, believing he should continue concentrating on his theatre career.
Reflecting on his early years filming Star Trek, Stewart recalled struggling to adjust to the more relaxed atmosphere among his fellow cast members.
He told the New Yorker in 2023: "And one of the cast members said, 'Oh, come on, Patrick, we've got to have some fun.' And I thumped the chair and said, 'We are not here to have fun' — which they have never let me forget. They taught me so much about loosening up and being freer."
