Question: Why did the director of film Santos Vega Returns die?
Sentence (from "Leopoldo Torres Ríos"): Rios initially solely began as a screenwriter, writing for his first film "Palomas rubias" in 1920 but by 1923 he began simultaneously directing and writing for his films, producing over 40 films between the early 1920s and 1959 when he was taken ill with lung cancer.
Relevant evidence: Yes