Red Dead Redemption 2 is an amazing single player experience (maybe the best I personally had in this generation). Once again Rockstar Games did a great work bringing to life the old west, with deep/interesting characters, and great storytelling.
Sadly, since Grand Theft Auto V, Rockstar don't seem interested anymore in doing single player DLCs, preferring to focus all their resources on multiplayer experiences. Because of that, it's highly unlikely that they will release single player DLCs this time.
That's why, if you loved the game and wish more immersive stories to be told with the same characters (or new ones), I suggest you to vote for this petition, and bring your wishes to the attention of Rockstar Games and maybe (who knows ?) change their minds.
Vote for single player DLCs for Red Dead Redemption 2 !
Zombie Arthur seeking revange would be cool, i mean, in the end the first UN was nothing but a dream so, it doesn't have to be cronologicly accurate, and even the zombie outbreak could be different if thats the case, this time it could have nothing to do with the mask, instead it could be some kind of illness or black magic that bring corpses back to life.