Maggie Smith, the masterful, scene-stealing actor who won an Oscar for “The Prime of Miss Jean Brodie” in 1969 and gained new fans in the 21st century as the dowager Countess of Grantham in “Downton Abbey” and Professor Minerva McGonagall in the Harry Potter films, died Friday. She was 89.

Smith’s sons, Chris Larkin and Toby Stephens, said in a statement that Smith died early Friday in a London hospital.