Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_11240028_1 ( last_appearance VARCHAR, portrayed_by VARCHAR )

### Question ###
Which episode did actor A. J. Buckley last appear in?

### Accurate SQL ###

SELECT last_appearance FROM table_11240028_1 WHERE portrayed_by = "A. J. Buckley"