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_name_37 (pick__number INTEGER, position VARCHAR, player VARCHAR)

### Question ###
The player is Tim Regan and the pick # is position of d, what's the sum?

### Accurate SQL ###

SELECT SUM(pick__number) FROM table_name_37 WHERE position = "d" AND player = "tim regan"