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Season 1 - Jun. 26, 2012
Season 2 - Feb. 12, 2014
Season 3 - Mar. 24, 2016
Season 4 - Mar. 26, 2017
Season 5 - Mar. 30, 2019
Season 6 - Mar. 21, 2021
Line of Duty Season 4 Episode 1
DCI Roz Huntley is under intense pressure from her superiors to apprehend a serial murderer after months of fruitless investigation.