Question: who plays dean's vampire friend on supernatural
[{'answer': 'Ty Olsson', 'provenance': [{'wikipedia_id': '21013155', 'title': 'List of Supernatural characters', 'start_paragraph_id': 395, 'start_character': 26, 'end_paragraph_id': 395, 'end_character': 35, 'bleu_score': 1.0, 'section': 'Section::::Other supernatural beings.:Benny Lafitte.\n'}]}, {'provenance': [{'wikipedia_id': '21013155', 'title': 'List of Supernatural characters', 'start_paragraph_id': 395, 'start_character': 0, 'end_paragraph_id': 395, 'end_character': 2616, 'bleu_score': 0.9957938778538491, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10600238949856599277}, 'section': 'Section::::Other supernatural beings.:Benny Lafitte.\n'}]}]