The fence is a man who the robbers of the Powell's home pawned off most of the stolen jewelry to. He appeared in "An Ideal Husband".
After robbing the Powell's dinner party, the group of robbers go to a local fence where they go to trade in all of the jewelry for money. The fence tells the robbers that he will give them forty thousand dollars for everything, but will not take Evelyn's blood red necklace because it is too valuable and too hot to handle. The robbers then tell the fence that that is fine and that they have enough money for what they need to do. They then leave and hand out all of the cash to homeless people. One of the robbers gives Evelyn's necklace to a homeless woman. ("An Ideal Husband")