Originally Posted by Jim_Gunn

Well, the Nucky Thompson character is based very closely on the real life Nucky Johnson who lived until 85 years old in 1968. But they did take quite a few liberties with the character so it's not unthinkable that they would kill him in the series. I think the fan theory I posted above makes the most sense based on all these flashbacks they are showing as well as the focus they have on this young character who happens to be the same age as Jimmy Darmody's son would be in 1931.