Question: who played the detective in little boy blue
[{'answer': 'Stephen Graham', 'provenance': [{'wikipedia_id': '53878309', 'title': 'Little Boy Blue (TV series)', 'start_paragraph_id': 18, 'start_character': 0, 'end_paragraph_id': 18, 'end_character': 14, 'bleu_score': 1.0, 'section': 'Section::::Production.\n'}]}, {'provenance': [{'wikipedia_id': '53878309', 'title': 'Little Boy Blue (TV series)', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 64, 'bleu_score': 0.6803749333171201, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9531007950580878879}, 'section': 'Section::::Cast.\n'}]}, {'provenance': [{'wikipedia_id': '53878309', 'title': 'Little Boy Blue (TV series)', 'section': 'Section::::Production.\n', 'start_paragraph_id': 18, 'end_paragraph_id': 18, 'meta': {'evidence_span': ['Stephen Graham was cast as Detective Superintendent Dave Kelly and Sinead Keenan and Brían F. O\'Byrne were cast as Melanie and Steve Jones, respectively in a new four-part drama titled "Little Boy Blue". On 18 April 2017, it was confirmed that the programme would begin its broadcasting on 24 April 2017 on a weekly basis, concluding on 15 May.', "Stephen Graham was cast as Detective Superintendent Dave Kelly and Sinead Keenan and Brían F. O'Byrne were cast as Melanie and Steve Jones, respectively in a new", 'Stephen Graham was cast as Detective Superintendent Dave Kelly and Sinead Keenan and Brían F. O\'Byrne were cast as Melanie and Steve Jones, respectively in a new four-part drama titled "Little Boy Blue".']}}]}]