CREATE TABLE table_2159506_4 (successor VARCHAR, reason_for_change VARCHAR)

Who are all successors when reason for change is died May 12, 1964?
SELECT successor FROM table_2159506_4 WHERE reason_for_change = "Died May 12, 1964"
SELECT "successor" FROM "table_2159506_4" WHERE "Died May 12, 1964" = "reason_for_change"