The character returned on 19 July 2016 with New Zealand actor Benedict Wall cast in the role. Wall originally auditioned for the role of Justin Morgan, but the part went to James Stewart. Wall was in New Zealand when the role of Duncan became available. He sent an audition tape to the producers and they offered him the part. Of his casting, Wall said "It wasn't lost on me that I wasn't from the right part of the world when I got the job. But you know what's funny is when I'm with Ray, I'm always surprised at how much we do seem alike." Wall worked on his Australian accent, but as the character has been living in the United States, it did not need to be too thick.