Question: who plays mr walker on 13 reasons why
[{'answer': 'Jake Weber', 'provenance': [{'wikipedia_id': '25247887', 'title': '13 Reasons Why', 'start_paragraph_id': 67, 'start_character': 16, 'end_paragraph_id': 67, 'end_character': 26, 'bleu_score': 1.0, 'section': 'Section::::Production.:Casting.\n'}]}]