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Roland's world isn't all desert.

He has his moments certainly. As I said above, I know who it was, (if you count the comics), and Sheemie had his part to play in those events. (I'm not saying he was the betrayer though.)



I...

John Farson's nephew was on John Farson's side. So unless he went undercover posing as one of the gunslinger's own... I doubt it.

The comic series The Fall of Gilead does give the answer though....