Line of Duty fans have a right to be suspicious - the BBC One series has a reputation for serious plot twists.The latest fan theory to emerge from the show sets its sights on Detective Sergeant Chris Lomax, who first appeared at the beginning of series six.One viewer noticed a striking resemblance between Lomax, played by Perry Fitzpatrick, and a photograph that was shown on Sunday's episode.It would link the copper to a serious crime, meaning more than one member of DI Jo Davidson's team is potentially corrupt.Viewers recently learned murdered journalist Gail Vella, at the time of her passing, had been investigating the chilling death of a young black man in custody.
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