In the last Kate Barlow flashback, Linda and her husband catch Kate and threaten her to turn over the loot she stole.
Kate: "Linda Miller, is that you?"
Linda: "Oh, I've been Linda Walker for the last thirteen years."
If that doesn't convince you, at the end, Warden Walker is trying to see inside the trunk, saying it was on her family's property, but Attorney. Carla Morengo says she has to get her hands off of it. I don't really feel like writing out that argument since they're talking over each other, but it's at about 1:42:30 or so.
Kate: "Linda Miller, is that you?"
Linda: "Oh, I've been Linda Walker for the last thirteen years."
If that doesn't convince you, at the end, Warden Walker is trying to see inside the trunk, saying it was on her family's property, but Mrs. Sweetfeet says she has to get her hands off of it. I don't really feel like writing out that argument since they're talking over each other, but it's at about 1:42:30 or so.