Line of Duty fans convinced DCI Joanne Davidson is connected to very familiar face after easy-to-miss clue

LINE of Duty theories have been amounting thick and fast, despite only being two episodes in to the brand new series.

Now fans of the BBC One hit show are convinced that DCI Joanne Davidson, played by Kelly Macdonald, is linked to events last season.

From the outset of series six, it's appeared as though the detective is hiding something – making Davidson one of the prime suspect when AC-12 start to investigate her unit.

But some viewers are sure her secret has already been discovered, as she's been linked to character John Corbett, played by Stephen Graham, in series five.

Fans have based their theories based on a blink-of-the eye moment, where a photograph of Davidson and and older woman is flashed on screen.

In the first episode, as DCI Jo sits in her apartment, she cradles a photograph of her and the woman before smashing the glass.

While the identity of the woman remains unknown, and is thought to be her mother, viewers noticed she resembled a previous character.

"As soon as I saw the picture I immediately thought of Anne-Marie McGillis," one eagle-eyed fan wrote to Twitter, comparing the resemblance.

Anne Marie McGillis is the biological mother of John Corbett, who Superintendent Ted Hastings formerly used as an informant.

"Joanne is related to Corbett in some way and has joined the OCG to bring them down and get justice for John," another speculator chimed in.

The viewers discussed in the comments how they felt Joanne was posing as a dodgy copper to take revenge.

While it's not clear if the theory is true, Corbett's widow Steph made a reappearance in episode two, suggesting the storyline will remain open.

Fans have flooded social media with other theories including spotting proof that shows Kate Fleming is working undercover.

They also think the former AC-12 DI knows exactly who the gobby child turned police officer Ryan is after spotting his file open on her computer.

In the latest epsiode episode, DCI Joanne Davidson was able to avoid arrest and set up her ex lover and ex colleague Farida Jatri and she was brought in for questioning after burner phones were found at her home.

As the episode drew to a close, Davidson met with a strange man to collect another burner phone before sobbing uncontrollably in her car.

This made it seem as though she is not leading a double life of her own free will.

Line of Duty continues at 9pm on Sunday BBC One.

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