Question: when did mcgee became a regular on ncis
[{'answer': 'season two', 'provenance': [{'wikipedia_id': '2668651', 'title': 'Timothy McGee', 'start_paragraph_id': 2, 'start_character': 84, 'end_paragraph_id': 2, 'end_character': 94, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'in season two', 'provenance': [{'wikipedia_id': '2668651', 'title': 'Timothy McGee', 'start_paragraph_id': 2, 'start_character': 81, 'end_paragraph_id': 2, 'end_character': 94, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2668651', 'title': 'Timothy McGee', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 155, 'bleu_score': 0.934334813046729, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14705074126883410273}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2668651', 'title': 'Timothy McGee', 'section': 'Section::::Abstract.', 'start_paragraph_id': 2, 'end_paragraph_id': 2, 'meta': {'evidence_span': ['Murray appeared as a guest star in eight episodes of the first season of "NCIS"; in season two he joined the main cast and was added to the opening credits.', 'Murray appeared as a guest star in eight episodes of the first season of "NCIS"; in season two he joined the main cast and was added to the opening credits.', 'Murray appeared as a guest star in eight episodes of the first season of "NCIS"; in season two he joined the main cast and was added to the opening credits.']}}]}]