Question: who kills tree gelbman in happy death day
[{'answer': 'Tree hangs herself', 'provenance': [{'wikipedia_id': '53835973', 'title': 'Happy Death Day', 'start_paragraph_id': 7, 'start_character': 675, 'end_paragraph_id': 7, 'end_character': 693, 'bleu_score': 1.0, 'section': 'Section::::Plot.\n'}]}]