Question: who plays ducky's assistant casey on ncis
[{'answer': 'Scott Wolf', 'provenance': [{'wikipedia_id': '11510033', 'title': 'List of NCIS characters', 'start_paragraph_id': 184, 'start_character': 15, 'end_paragraph_id': 184, 'end_character': 25, 'bleu_score': 1.0, 'section': 'Section::::Recurring and notable cast and characters.:Jonathan Cole.\n'}]}, {'provenance': [{'wikipedia_id': '11510033', 'title': 'List of NCIS characters', 'start_paragraph_id': 184, 'start_character': 0, 'end_paragraph_id': 184, 'end_character': 2646, 'bleu_score': 0.9955106338386541, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13827992859605119403}, 'section': 'Section::::Recurring and notable cast and characters.:Jonathan Cole.\n'}]}]