He is revealed to be The Carver, along with his sister Kit McGraw. He is one of the two main antagonists of the third season of the show.
It is revealed that Costa does not have a penis. He attributes this to a genetic disorder known as 5-alpha-reductase deficiency that he suffers as a product of incest.
He faked his death and he and his sister are last seen on a beach in Málaga, Spain, trolling for their next victim.