British actor Patrick Stewart died on Wednesday at the age of 86 after a short illness. Reports said the death was announced by his agent or on social media. One report said he died at his home in Los Angeles, surrounded by family and friends, and that he had Alzheimer’s disease and Lewy body dementia.

Stewart was known internationally for playing Captain Jean-Luc Picard in Star Trek: The Next Generation and Professor Charles Xavier in the X-Men films. Marvel Studios paid tribute to him on social media, describing him as a true gentleman.