Line Of Duty: Who is Ian Buckells? Here's what you need to know May 2, 2021 Line Of Duty fans have suddenly found Ian Buckells at the middle of their investigation into who 'H' is. Here's what you need to know about his Line Of Duty history. We first meet Ian Buckells in Line Of Duty season 1 where he's appointed the senior investigating officer in the case of Jackie Laverty's disappearance, when Tony Gates is taken off the case. We later discover Jackie Laverty is killed by the OCG in order to frame and blackmail Tony into doing as they ask. It's the same series where we're introduced to Ryan Pilkington, aka BMX boy, who supplied DCI Tony Gates with burner phones and tried to cut off Steve Arnott's fingers .