This Morning fans are experts on all things telly, as proven by the viewer reaction to an interview with a Line of Duty star on Thursday.Actor Gregory Piper, who plays the spine-chilling PC Pilkington on the show, joined hosts Alison Hammond and Dermot O'Leary in the studio.However, eagle-eyed fans spotted Alison making a mistake during the interview, as she tried to glean a spoiler from the BBC star.Alison asked Gregory whether he thought PC Pilkington would stretch to murder - only for fans to point out he already has."How far is your character actually going to go?" Alison wondered. "Is he going to actually kill somebody?
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