what is the {killed by} for {Alexander II of Russia} has {manner of death} as {homicide} ?
Who was murdered by Alexander II of Russia?
Who was killed by Alexander II of Russia as the manner of death as homicide?
SELECT ?x WHERE { ?f property:manner_of_death resource:homicide . ?f property:killed_by ?x . resource:Alexander_II_of_Russia property:manner_of_death ?f }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q83171> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1196> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q149086> .
?statement <http://www.wikidata.org/entity/P157> ?value. 
} 

SELECT ?value WHERE { wd:Q83171 p:P1196 ?s . ?s ps:P1196 wd:Q149086 . ?s pq:P157 ?value}