H & R Block should have given you a copy of the return. Here are the IRS instructions for filing a return for the deceased.
1. You will need to sign as executor or personal representative. Here are IRS instruction for filing and signing.
2. You will need to write "Deceased" and date of death on the top of the return.
3. Mail it in. Here is a link to the IRS for mailing. Please choose your state for the correct mailing address.
I am so very sorry for your loss.
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