found: Ramírez, C. Operación Gavin, 1987:p. 4 of cover (John Gavin; former actor; ambassador to Mexico during the Reagan administration)
found: Alfred Hitchcock's Psycho, c1995:credits (John Gavin)
found: Internet movie database, Sept. 11, 2000(John Gavin, birth name, Anthony Golenour, b. Apr. 8, 1928 in Los Angeles)
found: IMDb, July 27, 2005(John Gavin; b. Apr. 8, 1928, Los Angeles, Calif.; sometimes credited as John Gilmore, Jack Golenor; birth name: John Anthony Golenor; nickname: Jack)
found: New York times WWW site, viewed Feb. 12, 2018(in obituary published Feb. 9: John Gavin; b. John Anthony Golenor, Apr. 8, 1931, Los Angeles; d. Friday [Feb. 9, 2018], Beverly Hills, aged 86; strikingly handsome Hollywood actor who played romantic leads in the 1950s and '60s and was the Reagan administration's ambassador to Mexico for five years; appeared in films and on television)