Patrick Stewart, the actor whose theater background gave way to a decades-long screen career in Star Trek and X-Men, has died at 86, according to a message posted to his Instagram account. The statement said Stewart died Wednesday at his Los Angeles home. It described his death as following a brief and poignant journey with Alzheimer's Disease and Lewy Body Dementia.

Stewart was born in 1940 in Mirfield, Yorkshire, England, and began his acting career in theater. He later took the role of Captain Jean-Luc Picard in Star Trek: The Next Generation, which ran from 1987 to 1994. He returned to the character in the films Star Trek: Generations in 1994, Star Trek: First Contact in 1996, Star Trek: Insurrection in 1998, and Star Trek: Nemesis in 2002.

Stewart also played Professor Charles Xavier in several X-Men movies. Queen Elizabeth II knighted him in 2010.

The Instagram message credited Stewart with indelible performances across every genre, pointing to his voice and talent. It said he examined the human condition in all its poetic complexity and carried hope into the Marvel Cinematic Universe and into science fiction's most iconic final frontier aboard the Starship Enterprise.

For a US technology audience, the loss registers in the streaming catalogues where his work circulates: the Star Trek television series and films and the X-Men films remain widely available to American viewers, and the roles helped shape the franchises that studios and streaming services continue to build on.

Stewart's career moved from the stage into two of entertainment's largest franchises, and the characters he played became reference points for later film and television productions. The statement posted to his account did not give further details about his death or about memorial arrangements.

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