Question: What is the cause of death of director of film Riders Of The Purple Sage (1925 Film)?
Sentence (from "Riders of the Purple Sage (1925 film)"): Based on the 1912 novel "Riders of the Purple Sage" by Zane Grey, the film is about a former Texas Ranger who pursues a corrupt lawyer who abducted his married sister and niece.
Relevant evidence: No