This article will give you the reasons why you should close your bank account. Sample account closing letters are also given for your better understanding.Documentation about the account and its owner, including the deceased's full legal name, Social Security number, and the bank account number. Sub: Request to close an account due to death. The first and foremost thing you must do to close a bank account upon the death of a loved one is to inform the bank of this death. You have to write an application to the bank. You should produce the concerned Bank branch the death certificate from municipal authority as proof of that persons demise. Claims for deceased owners usually take four to six weeks from the date you upload the requested documents.