Leo D. Maloney
Leo D. Maloney (January 4, 1888 – November 2, 1929) was an American film actor, director, producer, and screenwriter of the silent era.
He appeared in 156 films between 1911 and 1929.
He also directed 47 films between 1914 and 1929.
Maloney was born in Santa Rosa, California and built the "Leo Maloney Studio" in the San Bernardino Mountains of Southern California.
Maloney's final film was one of the first sound pictures, 1929's "Overland Bound".
While at a party in Manhattan to celebrate the completion of that picture, Maloney suffered a fatal stroke.
Carmine Tramunti
Carmine" Mr. Gribbs" Tramunti( October 1, 1910 – October 15, 1978) was an Italian- born New York mobster who was the boss of the Lucchese crime family.
The Boss of Big Town
The Boss of Big Town is a 1942 American film directed by Arthur Dreifuss.
Ermias Ghermay
Ermias Ghermay is an Ethiopian people- smuggler who is believed to be the boss of one of the main human smuggling cartels in Libya.
Anthony Giordano
Antonio Rico Giuseppe Giordano( June 24, 1915 – August 29, 1980) was the boss of the St. Louis crime family.
The Boss of Rustler's Roost
The Boss of Rustler's Roost is a 1928 American silent western film directed by Leo D. Maloney and starring Eugenia Gilbert, Ben Corbett and Tom London.
Matthew Trupiano
Matthew M." Mike" Trupiano, Jr.( November 8, 1938 – October 22, 1997) was the boss of the St. Louis crime family from 1982 to 1997.
Kent Kane Parrot
Kent Kane Parrot (May 22, 1880 - March 11, 1956) was an American political figure and attorney who was considered the "boss" of municipal politics in Los Angeles, California, in the 1920s.
The Boss of It All
The Boss of It All is a 2006 Danish comedy film written and directed by Lars von Trier.
Hugh McLaughlin (politician)
Hugh McLaughlin( April 2, 1827 – December 7, 1904) was an American politician and for many years the" boss" of the Democratic Party in Brooklyn.

Question: What is the cause of death of director of film The Boss Of Rustler'S Roost?
Answer: stroke