Cause of death: acute pneumonia
John Gavin (born Juan Vincent Apablasa; April 8, 1931 – February 9, 2018) was an American actor and diplomat who was the president of the Screen Actors Guild (1971–1973), and the United States Ambassador to Mexico (1981–1986). Among the films he appeared in were A Time to Love and a Time to Die (1958), Imitation of Life (1959), Spartacus (1960), Psycho (1960), Midnight Lace (1960) and Thoroughly Modern Millie (1967), playing leading roles for producer Ross Hunter.
Source : Wikipedia