Line of Duty stars pay emotional tribute to colleague who passed away

Warning: Sunday night's Line of Duty spoilers ahead! On Sunday night, millions of viewers (9.6, to be specific) tuned in to watch the gripping end to series five of Line of Duty.

But for the cast and crew of the hit TV show, the programme had a very poignant meaning to it too.

Line of Duty dedicated the episode to Graeme Livingstone, a former member of the show's crew, who passed away in a motorcycle accident two years ago. Graeme, who was just 29 years old, died in Lisburn, Northern Ireland.

The finale episode was dedicated to the memory of Graeme, who worked on the show for two series.

And prior to the programme airing, the show's stars, Vicky McClure and Martin Compston, also paid tribute to their former crew member with some touching messages.

Martin, who plays Steve Arnott, shared a picture of the Line of Duty crew, and another of Graeme.

In a touching tribute, he wrote, 'Behind every good cast there’s a phenomenal crew.

‘To make this show really is a team effort. One important face missing from that top picture though. ‘Graeme Livingstone gone but never forgotten, not just to us but the industry across Northern Ireland.’

Vicky, who plays Kate Fleming, shared a similar message alongside a picture of Graeme.

She wrote, 'Huge thank you to the LOD family for making this such a special series! 🎬 And to everyone of you that tuned in!!! 📺

'Graeme who worked in our props dept will always be in our hearts, we miss him dearly. ❤️'

The final episode of series five of Line of Duty saw fans floored by by the revelation that AC-12's lawyer Gill Biggeloe had been setting up Ted Hastings.

However, some fans were left frustrated that there was no ultimate revelation of the elusive 'H' - something the final moments of the episode led us to believe would likely be resolved in season six.

But only time will tell! We can't wait for more episodes...