Line of Duty spoilers follow.
In Line of Duty's latest episode, there was a callback to a character from the first season of the police corruption drama that well and truly set the ball rolling.
As part of AC-12's investigation into DCI Jo Davidson (Kelly Macdonald) and Operation Lighthouse, Ted, Steve and Chloe Bishop (Shalom Brune-Franklin) gathered to scrutinise archive footage of murdered journalist Gail Vella at work.
One of the stories that she covered during her reporting days was the accidental killing of Karim Ali, and the recording used during that scene also featured in the series' first episode.
Standing on the steps of the courthouse prior to the inquest into Karim's death, Chief Inspector Philip Osborne (Owen Teale) defended the actions of his team, much to the disgust of Hastings.
"They lied through their teeth, every single one of them," he said. "Except you Steve. I mean, talk about an outrage."
Before Steve rocked up in anti-corruption, he was working in counter terrorism and was part of the operation that lead to the killing of Karim. After receiving the "Fahrenheit" order from Osborne, then a commanding officer prior to his promotion, Steve directed the firearms officers to descend upon the flat.
They burst in, thinking Karim was armed, and opened fire on him. But there were no explosives or weapons of any kind on his person. Instead, he was holding his child in his arms, with both of them falling to the ground when the police opened fire.
When Steve arrived at the scene, he was horrified to discover that the team had entered the wrong property. Flat 56 had been the intended target, but a mix-up saw them barge into flat 59 and Karim and his family paid the price.
As they were driving away from the crime scene, Osborne firmly instructed his officers to fabricate what happened in their statements. As far as they were concerned, they heard a struggle inside the walls of the flat, shouted "armed police" and entered. The suspect was acting aggressively and was ordered to surrender but he didn't comply, instead lurching towards them. In the end, they had no choice but to act.
"I want those statements copperplated by noon," added Osborne.
All of the officers bar one lied about what had really happened, with Steve point-blank refusing to obey Osborne's orders.
"An innocent man was killed, sir," said Steve. "I won't lie."
"You passed on the order," barked Osborne. "Where were your reservations when it mattered? You're finished."
That chain of events was the catalyst for Steve's move to AC-12. He was recruited by Hastings to join his department and the rest, as they say, is history. It also gave us an insight into the type of character that Steve is: an unshakeably moral man, even in situations when it would be so much easier to leave his principles at the door.
In a show where you never really know who you can trust, Steve is the anchor that we cling to when the seas are at their choppiest.
Karim's death also set the tone for what was to come, chucking viewers straight into the fray and showcasing the challenging and extensive job that AC-12 has on its hands, much to the dismay of the MET Police Commissioner herself, Cressida Dick.
"I was absolutely outraged by the level of casual and extreme corruption that was being portrayed as the way the police is in 2018," she told Radio Times. "It's so far from that. The standards and professionalism are so high."
As you'd expect, Line of Duty creator Jed Mercurio had a few choice words of his own.
"My inspiration for writing #LineofDuty was @metpoliceuk shooting an innocent man and their dishonesty in the aftermath, so thanks to Cressida Dick for reminding me of our connection," he tweeted.
He was referring to Jean Charles de Menezes, a Brazilian man who was shot and killed by police at Stockwell Tube station in July 2005. He was mistaken for a suicide bomber, with a jury later ruling that he was unlawfully killed.
Line of Duty continues on Sunday, April 4 on BBC One at 9pm.
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