Question: who is the serial killer in bates motel
[{'answer': 'Norman', 'provenance': [{'wikipedia_id': '50662', 'title': 'Norman Bates', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 6, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '50662', 'title': 'Norman Bates', 'start_paragraph_id': 29, 'start_character': 0, 'end_paragraph_id': 29, 'end_character': 433, 'bleu_score': 0.946696567412954, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11970479139495793617}, 'section': 'Section::::Television.:"Bates Motel" (TV series).\n'}]}]