Was cast in the role of Buffalo Bill Cody in the MGM film Annie Get Your Gun (1950) but died in his sleep of a heart attack after only shooting the opening scene. He was replaced by Louis Calhern.
Was involved in a serious car accident in December 1939, when their car crashed in New Mexico. Frank and his son George Morgan were not hurt, his wife Alma reinjured an already bad knee that often left her incapacitated, and their chauffeur/house servant was killed.
Wife Alma Muller (1895-1970) was the daughter of a New York real estate magnate and a woman suffragette. They eloped in 1914.
Youngest of eleven children (six boys and five girls) of the co-founder of the Angostura-Wuppermann Corporation which marketed bitters used in drinks and cocktails.