From a New York Times obit by Alex Williams headlined Walter Mirisch, Pioneering Producer of Canonical Films, Dies at 101″:

Walter Mirisch, a film producer who with his two brothers ran a pioneering independent production company that helped bring to the screen a raft of canonical films, including the Oscar best-picture winners “West Side Story,” “The Apartment” and “In the Heat of the Night,” died in Los Angeles.

His death was announced by the Academy of Motion Picture Arts and Sciences, which he once led.