Question: What was the name of Martin Luther King's parent who died from a firearm?
Answer(s):
answer: Alberta Williams King

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.051cc)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.051cc ns:people.person.parents ?x .
?x ns:people.deceased_person.cause_of_death ns:m.034qg . 
}