user: Question: Name the vacator for Tennessee 1st
Columns: ['District', 'Vacator', 'Reason for change', 'Successor', 'Date successor seated']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Arkansas 6th', 'William F. Norrell (D)', 'Died February 15, 1961', 'Catherine Dorris Norrell (D)', 'April 18, 1961']
SQL:

assistant: SELECT "Vacator" FROM "Table" WHERE "District" = 'Tennessee 1st';