Question: when did the guy who played robbie rotten die
[{'answer': '21 August 2018', 'provenance': [{'wikipedia_id': '2745936', 'title': 'Stefán Karl Stefánsson', 'start_paragraph_id': 1, 'start_character': 43, 'end_paragraph_id': 1, 'end_character': 57, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2745936', 'title': 'Stefán Karl Stefánsson', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 187, 'bleu_score': 0.730036551821803, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 175095508887298379}, 'section': 'Section::::Abstract.'}]}]