Low Winter Sun (British TV series)

Low Winter Sun is a two-part miniseries that first aired on Channel 4 in Great Britain, in 2006. It was aired in the United States by BBC America. The series, written by Simon Donald, stars Mark Strong as Detective Sergeant Frank Agnew, a police officer who murders a fellow officer and believes he has committed the perfect crime. The miniseries was adapted into a 10-episode series by AMC, with Strong reprising his role as Detective Agnew.

Plot
Detective Sergeant Frank Agnew and his colleague DS Joe Geddes kill a fellow detective, Brendan McCann, whom Agnew believes is responsible for the murder of his girlfriend. They stage the crime to make it look like a suicide, but soon their actions spiral out of control and they find themselves caught up in a web of deceit, betrayal, and murder.