From Instructions for Form 1040-X
Deceased taxpayer. If filing Form 1040-X for a deceased taxpayer, write or type “Deceased,” the deceased taxpayer's name, and the date of death across the top of Form 1040-X, page 1.
If you originally filed a joint return and you are filing Form 1040-X to claim a refund with respect to that joint return as a surviving spouse, sign the return and enter “Filing as surviving spouse” in the area where you sign the return. If someone else is the personal representative, he or she must also sign.
Claiming a refund for a deceased taxpayer. If you are filing a joint return as a surviving spouse, you only need to file Form 1040-X to claim the refund. If you are a court-appointed personal representative or any other person claiming the refund, file Form 1040-X and attach Form 1310, Statement of Person Claiming Refund Due a Deceased Taxpayer, and any other information required by its instructions.
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