Hector Fellowes is a minor character in Red Dead Redemption 2.
Background
Sometime before 1899, Fellowes established himself as the newspaper tycoon of Saint Denis, and generated a strong dislike for Mayor Lemieux.
Events of Red Dead Redemption 2
At the Mayor's party, Fellowes can be seen talking with Bill Williamson and another partygoer. He tries talking to Bill, but Bill's awkward and confused replies ruin the conversation and Fellowes leaves. Additionally, Angelo Bronte points out Fellowes as one of the guests, describing him as "that wretched newspaper man" and suggesting that Dutch could kill Fellowes for him one day.
Later on, Arthur is contacted by Mayor Lemieux and offered work as a blackmailer. As one of these jobs, the player is tasked to intimidate Hector Fellowes into giving a large donation to the city, in order to build a new library. After learning that Fellowes is on a stagecoach leaving the city, the player boards the carriage and asks Fellowes for his donation. Fellowes refuses, which results in the player grabbing him and holding him out over the road and threatening him further. Fellowes then caves in, and the player rides away, after reminding him to send the cheque promptly.