Question: what actor died that played in harry potter
[{'answer': 'Robert Arthur Knox', 'provenance': [{'wikipedia_id': '17594623', 'title': 'Rob Knox', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '17594623', 'title': 'Rob Knox', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 251, 'bleu_score': 0.9560167778278961, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1297852625079647636}, 'section': 'Section::::Abstract.'}]}]