LOS ANGELES — Patrick Stewart, the British actor whose 60-year career spanned the stage to the final frontier, has died. He was 86.

Stewart died Wednesday at his home in Los Angeles from Alzheimer's disease and Lewy body dementia, his longtime spokesperson Kelly Bush Novak said in a statement.

"He has been held in the warm embrace of family and friends, surrounded by live music, prayer, tears, laughter and the kind of profound emotion that only he could inspire after a lifetime of devotion to us all," Novak's statement continued. "We will forever cherish the peaceful ease and reflection on his face, an enduring reminder of his invincible grace.

"His sonorous voice and singular talent will forever be synonymous with indelible performances in every genre. He explored the human condition in all its poetic complexity and brought hope not only to the far reaches of the Marvel Cinematic Universe, but into science fiction's most iconic final frontier aboard the Starship Enterprise."

A classically trained stage actor, Stewart was relatively unknown to American audiences when he was cast to lead a revival of "Star Trek." The original series, created by Gene Roddenberry, was canceled after three seasons in 1969, but gained a cult following in syndication that led to an animated show and a series of films starring the original cast. "Star Trek: The Next Generation" would be the first to follow a whole new Enterprise and crew.

The Times famously described Stewart as "an unknown British Shakespearean actor" in a 1987 story announcing his casting as the starship's captain, Jean-Luc Picard. Stewart never let fans (or this publication) forget it.

The story "said the Captain will be played by an unknown British Shakespearean actor," Stewart recalled during a 2015 interview with The Times. "I was a little disappointed by that. Then my friend Brent Spiner, who was in the series, had a sign made that he had somebody stick on the front door of my trailer which said, 'Beware. Unknown British Shakespearean actor.'"

Picard became one of Stewart's signature roles. He portrayed the Federation officer through the entirety of "The Next Generation's" seven-season run, in four feature films and, after a 20-year break, for three seasons of "Star Trek: Picard."

Besides the distinguished Starfleet officer, Stewart is also known for his portrayal of Professor Charles Xavier in the "X-Men" franchise. A powerful mutant with telepathic abilities, Xavier founded the Xavier School for Gifted Youngsters, a boarding school where young mutants get a chance to thrive. He's also the leader of the mutant superhero team, the X-Men.

In addition to Fox's original "X-Men" trilogy, Stewart portrayed a version of the character in Marvel Studios' "Doctor Strange in the Multiverse of Madness" (2022) and will appear in the upcoming "Avengers: Doomsday" (in theaters Dec. 18).

"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,'" Marvel Studios said in statement. "He was a singular talent, a generous collaborator and a true gentleman. Our hearts go out to his wife Sunny, his children, his friends and the countless fans around the world whose lives he touched with his art."

Stewart is survived by his wife Sunny and children Daniel and Sophie Alexandra Stewart.

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