Question: Who killed John Lennon?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX onto: <http://dbpedia.org/ontology/> 
PREFIX res: <http://dbpedia.org/resource/> 
PREFIX prop: <http://dbpedia.org/property/> 
SELECT DISTINCT ?uri
WHERE { 
         ?uri rdf:type onto:Person.
         ?uri prop:conviction res:Death_of_John_Lennon.
}