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Line of Duty Season 3

Police sergeant Danny Waldron shoots unarmed criminal Ronan Murphy dead and, when his colleagues arrive on the scene, tells them it was an act of self defence, insisting they back him up. A witness disputes his account and he comes before the anti-corruption unit led by Ted Hastings, who is unimpressed by Waldron's arrogance. Kate goes undercover with his team, noting that officer Hari Bains is the weak link, though he will not testify against Waldron. Kate then joins the team's assault on a house, ending in bloodshed.