Dot Cottan star addresses Jo Davidson’s relative rumours on Line of Duty: ‘You’re right’

Line of Duty: Ted Hastings shocked by surprise DNA findings

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The latest episode of Line of Duty ended on a major cliffhanger leaving fans guessing as to who DCI Joanne Davidson’s (played by Kelly MacDonald) blood relative could be. The fourth instalment of the BBC cop drama kept viewers on the edge of their seats, especially after DS Steve Arnott (Martin Compston) got caught up in an ambush. However, as the programme came to a close, Steve presented Superintendent Ted Hastings (Adrian Dunbar) a DNA file that proved DCI Davidson was related to someone else in the police database. But could it be Dot Cottan (Craig Parkinson)?

Fans have thrown plenty of theories into the mix as to who the mystery person could be including Matthew ‘Dot’ Cottan, Tommy Hunter (Brian McCardle) and even John Corbett (Stephen Graham).

Some fans even tried to pause the last scene to try and get a glimpse of what was written on Superintendent Hasting’s piece of paper.

Taking to Twitter, one fan quizzed actor Craig as to who the person could be and as a result, he ruled his own character Dot out of the running following his death in the finale of season three.

Despite almost escaping the clutches of AC-12, Dot lost his life jumping in front of DI Kate Fleming (Vicky McClure) to stop her from getting shot.

The fan tweeted: “In Obsessed [Craig’s Line of Duty podcast] you said the DNA match is another officer.

“I thought Steve says it was checked across the whole database as they didn’t know they were looking for an officer. I thought that meant it was a match to a non-copper! Am I wrong?” (sic)

To which Craig simply replied: “Well yes. You’re right on this.”

Craig’s comment implies that the person who is related to DCI Davidson is not or was not a serving police officer.

Other fans were quick to comment on Craig’s response and many have come up with the theory that John Corbett is somehow DCI Davidson’s brother.

John may have been a serving police officer, but in a previous series, it was revealed John’s information was wiped from the police database, meaning he could be related to DCI Davidson.

One fan predicted: “She’s John Corbett’s sister. Hence why John’s wife has randomly been in this series, why she slept with Steve (drama!) and why she’s receiving money from an unknown source (Jo is giving her the money she’s getting from a reluctant deal with the OCG).”

Another agreed: “Yeah it felt so incredibly out of place she kept popping up. Pretty sure that photo Jo has in her flat is John’s mum too – judging by the pic we saw of her last series. I’m really hoping this means it turns out Ted is their dad!” (sic) 

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As Sunday’s episode came to an end, the surprise DNA results were presented to Superintendent Hastings by Steve and DS Chloe Bishop (Shalom Brune-Franklin).

“We have investigated DCI Davidson’s version of events, an extended search at Farida Jatri’s (Anneika Rose) house detected a small number of DNA deposits closely matching an individual whose DNA is stored on the police database,” Chloe began.

“Joanne Davidson,” Steve continued.

Supt Hastings praised: “Great work, we’ve got her. She’s told a pack of lies about her relationship with Farida Jatri.”

Chloe continued: “Not only that sir, it means there was ample opportunity for Davidson to plant the burner phones at the property.”

Steve presented the Gaffer with a folder as he chipped in: “This isn’t the most significant finding sir.

“As we know sir, officer samples are stored to exclude contamination of crime scenes, an officer’s DNA isn’t speculatively examined on a routine basis and certainly wasn’t back when Davidson joined the force,” Steve added.

“Because the DNA deposits detected at the house weren’t assumed to relate solely to a police officer, they were compared against the whole system.

“The analysis detected partial matches to a nominal who’s also stored on other police databases. It’s identified over the page.

“As we know sir, there’s only one credible explanation for Jo Davidson’s DNA matching this individual, they’re blood relatives.”

Are fans right in thinking DCI Davidson’s match is John Corbett? Or will it be someone else entirely? 

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

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