Netflix has unveiled the trailer for the fourth and final season of The Killing, which it will premiere exclusively on August 1.

Netflix says: "The story picks up right after the season three finale. As Detective Linden (Mireille Enos) and Detective Holder (Joel Kinnaman) struggle to manage the fallout from their rash actions at the end of last season, they are assigned a new case - a picture perfect family is murdered, survived only by the son, Kyle Stansbury (Tyler Ross), who was shot in the head during the massacre."

The new series sees Joan Allen guest star as Colonel Margaret Rayne, the principal of the military academy where the young character Kyle is a student.

Netflix is currently streaming seasons one, two and three. 

The Killing