Question: Why did the director of film Tiefland (Film) die?
Sentence (from "Tiefland (film)"): Tiefland (Lowlands) is a 1954 German film directed, produced, co-written, edited by and starring Leni Riefenstahl, and based on the 1903 eponymous opera composed by Eugen d'Albert to a libretto by Rudolph Lothar based on the Catalan play "Terra baixa" by Àngel Guimerà.
Relevant evidence: Yes