The search for the corrupt copper has been going on for three series now, with theories circulating all over the internet in that time.
What we know so far is that all signs were pointing to Hastings being the guilty party in series five, but Kate and Steve worked to clear his name.
It was also revealed in series five that Matthew ‘Dot’ Cottan – the bent copper viewers all loved to hate – tapped his fingers in morse code four times during his final moments in series three, signifying that there are actually four ‘H’ officers in the force.
Three of them have already been identified – Derek Hilton (Paul Higgins), Gill Biggeloe (Polly Walker) and Cottan. Who is the other officer? Only time will tell.
Meanwhile, there are plenty of names and faces that crop up across various series of the show. In fact, keeping up with them all is a job worthy of AC-12’s finest minds all on its own.
Viewers first saw him terrorise residents of Moss Heath’s Borogrove Estate working for crime boss Tommy Hunter back in series one.
Years later, he cropped up in series five as a more senior member of the Organised Crime Gang.
The chapter saw him enrol as a police officer – presumably to act as a mole for the Organised Crime Gang – and he’s set to play a key part in the remaining episodes of series six.
Line of Duty series six continues tonight at 9pm on BBC One. Series one – five is available to stream on iPlayer now.
Got a story?
If you’ve got a celebrity story, video or pictures get in touch with the Metro.co.uk entertainment team by emailing us firstname.lastname@example.org, calling 020 3615 2145 or by visiting our Submit Stuff page – we’d love to hear from you.
MORE : Line Of Duty’s Thandie Newton ‘derailed’ after being abused by director at 16: ‘I was traumatised’
MORE : Line of Duty series 6: Superfan conducts own investigation as she reveals bombshell H theory
Thanks for reading the whole article. If you wish to get an daily update about Line of Duty series 6: Are all the cases on the show connected? , click on the bell button to subscribe for the notifications.