Although Donna actually coerced Duncan into assisting her suicide, the letter makes it appear to be murder. The season ends with Duncan in jail and Jimmy Perez arrested for perverting the course of justice, leaving his future with the police in doubt. Key Character Developments

: The sixth series of "Shetland" was broadcast on BBC One Scotland and BBC Two in the UK. It received positive reviews for its storytelling, character development, and the way it tackles complex social issues.