Meet the Line of Duty Series 6 Cast
Exactly Who's Returning For Series 6 of Line of Duty and the Newcomers Joining the Force
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Kelly Macdonald joins the cast in season six as DCI Joanne Davidson, whose unconventional techniques in investigating an unsolved murder raise suspicions among the AC-12 team. Macdonald is best known for her role in Boardwalk Empire and for voicing Merida in the animated film Brave.