Introduced as Chris McCoy's ancestor, Duncan lived around the 1600s and was the Pilgrim ship's carpenter.
Events of Criminal Case
During the murder investigation of Stuart Huckabee, Jones and the player found a sculpture which read, "The Huckabees will forever be the sworn enemies of the McCoys". Alex determined it was made by Duncan. The family feud between the McCoys and the Huckabees was apparently going strong to this day, so the team decided to speak to Duncan's descendant Chris McCoy, who became the prime suspect since he hated Stuart and all the Huckabees, and was also happy about Stuart's death.
Afterwards, the team found an ancient parchment, which revealed that Duncan was put in trial by Stuart's ancestor Reginald Huckabee for cannibalism, sentencing the whole McCoy family to a life of poverty. The team needed more answers, deciding to speak to Chris one more time. Chris got mad at the team for bringing up the topic. He stated that the whole city knew about this incident because of Stuart. He also said that it was freezing cold back in 1642 and that people were dying of hunger. It was eat or die and all Duncan wanted was to try and survive. Jones asked Chris whether Duncan ate a child, infuriating the former, who in response said Duncan only ate an old man who was going to die anyway.