It was obvious from the beginning. Willis saved you so you're a good guy? You guessed there was a "third party killer" so you have to be a doctor?

Uma, Willis, Stallone, if you really think I'm mafia, let's go over some numbers assuming I am.

Today: Lynch Jackson
Tonight: I kill one of you.
Tomorrow: You lynch me and win.

You want a role-claim? I'm the Fairy smurfing Godmother, and I can grant you one last wish.
And since I'm the best smurfing Fairy in the whole smurfing Fairyland, it's a twofer.

You get to kill Sam Jackson, and you get to win this mindsmurf of a game.