user: Question: What was the district when the reason for change was Died January 1, 1974?
Columns: ['District', 'Vacator', 'Reason for change', 'Successor', 'Date successor seated']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Michigan 7th', 'Donald W. Riegle, Jr. (R)', 'Switched party affiliation', 'Donald W. Riegle, Jr. (D)', 'February 27, 1973']
SQL:

assistant: SELECT "District" FROM "Table" WHERE "Reason for change" = 'Died January 1, 1974';