According to Deadline, the actor died on Saturday night following unexpected complications after a brief stay at the UCLA Medical Center in Los Angeles.
Landau made his mark on the big screen as early as his second feature film when he starred in a key supporting role in Alfred Hitchcock's North By Northwest. He would go on to have a varied career that saw him easily move between film and television roles at a time when not many other actors did.
He had regular roles on the original Mission: Impossible series and Space 1999, but also made notable guest appearances in the likes of Columbo, The Twilight Zone and more recently, Entourage. On the big screen, he appeared in the likes of Cleopatra, The Call Me Mr. Tibbs!, Rounders, Sleepy Hollow, The Majestic and Frankenweenie.
He scored Oscar nominations for his performances in Woody Allen's Crimes and Misdemeanours and Francis Ford Coppola's Tucker: The Man and His Dream, but it was Tim Burton's Ed Wood that saw him finally take home the gold for his turn as Bela Legosi.
He is survived by his two daughters.