Question: What is the date of death of the director of film Mutyala Muggu?
Sentence (from "Bapu (film director)"): Sattiraju Lakshmi Narayana (15 December 1933 – 31 August 2014), known professionally as Bapu, was an Indian film director, painter, illustrator, cartoonist, screenwriter, music artist, and designer known for his works in Telugu cinema, and bollywood.
Relevant evidence: Yes