By the 1990s Fuller had largely retired from the film business. Since May 19, 2001, he has been married to actress Jennifer Savidge, known for her role on NBC's "St. Elsewhere" series. Through Savidge, Fuller also became very good friends with her acting coach, veteran producer and actor Norman Lloyd, who played Dr. Daniel Auschlander. Formerly, Fuller was married for 22 years to Patricia Lee Lyon, whom he wed on December 20, 1962, and with whom he has three children: Rob, Christine, and Patrick. The two divorced in 1984; Lyon died the year after the divorce.