KELLY MACDONALD is set to star as a special guest in the new series of Line of Duty.

The actress will play the role of Detective Chief Inspector Joanne Davidson.

BBC One announced the news on Twitter, they said: "Kelly Macdonald will star as guest lead in the next series of #LineOfDuty.

"She's playing Detective Chief Inspector Joanne Davidson, the senior investigating officer of an unsolved murder, whose unconventional conduct raises suspicions at AC-12."

Macdonald is best known for her roles in Trainspotting, Gosford Park, State Of Play, No Country For Old Men, Boardwalk Empire and, most recently, The Victim and Giri/Haji.

Line of Duty writer Jed Mercurio, said: "We're honoured that Kelly Macdonald will join Martin, Vicky and Adrian in series six of Line Of Duty.

"DCI Joanne Davidson will prove the most enigmatic adversary AC-12 have ever faced."

Simon Heath, CEO and Creative Director of World Productions, added: "The Line Of Duty team have always been huge fans of her work, so we’re thrilled Kelly has agreed to join us this series to pit her wits against AC-12."

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