question: What is the cause of death of director of film The Sap (1926 Film)?
context: Title: The Sap (1926 film)
  Passage: The Sap is a 1926 American comedy film directed by Erle C. Kenton and written by Edward T. Lowe Jr.. It is based on the 1924 play "The Sap" by William A. Grew. The film stars Kenneth Harlan, Heinie Conklin, Mary McAllister, David Butler, Eulalie Jensen and John Cossar. The film was released by Warner Bros. on March 20, 1926.
  Title: Erle C. Kenton
  Passage: Erle C. Kenton (August 1, 1896 – January 28, 1980) was an American film director. He directed 131 films between 1916 and 1957. He was born in Norborne, Missouri and died in Glendale, California from Parkinson's disease. Kenton and Edward Ludwig were the principal directors of the 1958-1960 CBS television series, "The Texan", starring Rory Calhoun as Bill Longley, a "Robin Hood of the West", who drifts through the region helping persons in need.
answer: Parkinson
citations: Erle C. Kenton The Sap (1926 film)