They soon discover that the Tuttle and Childress families — to whom both Reggie and Dewall Ledoux belong — are related, and have long histories of child abuse and murder. They ultimately discover that the killer is a Childress, and go to the late sheriff's home to investigate. Cohle and Hart go to the Childress house, where they find that the sheriff's son, Errol (Glenn Fleshler), is the killer, and discover the remains of his father tied up in a shed. They also encounter Betty Childress (Ann Dowd), his mentally disabled half-sister, with whom he is having an incestuous relationship. Cohle pursues Childress into the catacombs behind the house, which Childress identifies as Carcosa. Cohle discovers an idol draped in yellow and covered in skulls — the "Yellow King" — and has a hallucination of a spiraling vortex, the same vortex that had been drawn on many of the victims over the past 17 years. Childress stabs Cohle in the gut and also attacks Hart, but Cohle saves his partner by shooting Childress in the head, killing him. Gilbough and Papania, whom Hart had called, arrive at the scene. With the evidence Hart and Cohle collected, they connect Childress to dozens of murders, including Dora Lange's. Cohle falls into a coma, during which he feels the loving presence of his father and daughter. He later wakes up in hospital and leaves with Hart, and looks up at the night sky, telling his partner, "Once there was only dark. If you ask me, the light's winning." McConaughey received critical acclaim for his portrayal of Cohle, and has won and been nominated for several awards, including: