William Close wurde am 7 Juni 1924 in Greenwich, Connecticut, USA geboren. Er war mit Bettine verheiratet. Er starb am 15 Januar 2009 in Big Piney, Wyoming, USA.
Besides his daughter Glenn Close, he is also survived by daughter Tina Close of Wilson, Wyoming; daughter Jessie Close of Bozeman, Montana; son Alexander D. Close of Belgrade, Montana; and daughter Tambu Misoki of Sacramento, California.