Question: when does king joffrey die in game of thrones
[{'answer': 'The Purple Wedding'}, {'provenance': [{'wikipedia_id': '1888698', 'title': 'Joffrey Baratheon', 'start_paragraph_id': 17, 'start_character': 0, 'end_paragraph_id': 17, 'end_character': 1245, 'bleu_score': 0.635782124449182, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17485938986422086687}, 'section': 'Section::::Storylines.:"A Storm of Swords".\n'}]}]