what is the {statement is subject of} for {Jimi Hendrix} has {cause of death} as {asphyxia} ?
Why did Jimi Hendrix die of asphyxia?
What caused Jimi Hendrix to die from asphyxia?
SELECT ?o WHERE { resource:Jimi_Hendrix property:cause_of_death ?h . ?h property:cause_of_death resource:asphyxia . ?h property:statement_is_subject_of ?o }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q5928> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P509> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q193840> .
?statement <http://www.wikidata.org/entity/P805> ?value. 
} 

SELECT ?value WHERE { wd:Q5928 p:P509 ?s . ?s ps:P509 wd:Q193840 . ?s pq:P805 ?value}