Might not matter where they still had their residence at the time.
States vary, but over time more are taxing full-year income regardless of where earned. Then they adjust based on % earned in what state, or $ earned in each state, or they apportion by date. Home state will give credit for tax paid to another jurisdiction, usually up to the amount they tax on that same income.
You'll need to research what KY and WI want for part-year resident reporting.