Line Of Duty star Stephen Graham admits he 'always knew' John Corbett would ...

Line Of Duty star Stephen Graham has admitted he always knew his character John Corbett would be killed off.

Speaking on The Jonathan Ross Show, the star confessed writer Jed Mercurio told him from the start the undercover officer would meet a gruesome fate, but still branded the role a 'huge honour.'

It came as Stephen remained tight-lipped about the identity of the sinister crime boss H, ahead of the fifth series' feature-length finale on Sunday. 

Truth: Line Of Duty star Stephen Graham has admitted he always knew his character John Corbett would be killed off

Truth: Line Of Duty star Stephen Graham has admitted he always knew his character John Corbett would be killed off

Stephen told Jonathan: '[Jed Mercurio] asked me ''would I do it?'' He said when he wrote it he had me in mind so that was a huge honour, someone like Jed. 

'He's very successful and he's a fantastic writer. He told me straightaway from the start what was going to happen to the character, which is why I found it was really interesting.'

Stephen's character was introduced into Line Of Duty's fifth series as an undercover officer working in an organised crime group, but questions were raised around whether his loyalties had turned.

RIP: The star told Jonathan Ross writer Jed Mercurio told him from the start that DS John Corbett would meet a gruesome fate, after his undercover operation was exposed

RIP: The star told Jonathan Ross writer Jed Mercurio told him from the start that DS John Corbett would meet a gruesome fate, after his undercover operation was exposed

In an explosive twist fans were left reeling when Corbett was brutally killed by the OCG, after they discovered he was working with the police to try and track down the ever elusive H.

Despite endless grillings about H's identity, Stephen went onto insist he has no idea who the character is, and whether his identity will be revealed in Sunday's finale.

He said: 'On my ma's life, no. I'm serious. I don't know. I read the script but I'm not giving anything away.' 

It's a secret! And despite a grilling by host Jonathan, Stephen remained tight-lipped about the identity of crime boss H, ahead of Line Of Duty's feature-length finale on Sunday

It's a secret! And despite a grilling by host Jonathan, Stephen remained tight-lipped about the identity of crime boss H, ahead of Line Of Duty's feature-length finale on Sunday

Tight-lipped: The star said: 'On my ma's life, no. I'm serious. I don't know. I read the script but I'm not giving anything away'

Tight-lipped: The star said: 'On my ma's life, no. I'm serious. I don't know. I read the script but I'm not giving anything away'

It remains to be seen whether H's identity will be revealed, as Line Of Duty has already been renewed for a sixth series by the BBC.

Stephen is also well-known for his roles in the series' This Is England and Boardwalk Empire.

The star has recently been working with Robert De Niro and Al Pacino, as they star in Martin Scorsese's epic The Irishman.

Acclaimed: Stephen also spoke about his experience working with Robert De Niro and Al Pacino, on the upcoming mafia drama The Irishman

Acclaimed: Stephen also spoke about his experience working with Robert De Niro and Al Pacino, on the upcoming mafia drama The Irishman

Speaking about his experience working with the heavyweights, Stephen told Jonathan the role was a turning point in his career, after Taxi Driver inspired him to become an actor.

He explained: 'That's kind of, being a kid from where I'm from, and growing up and going to the

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