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