Yes if you are the personal representative of his estate (an executor, administrator, or anyone else in charge of the decedent's property).
In general, the final individual income tax return of a decedent is
prepared and filed in the same manner as when they were alive. All
income up to the date of death must be reported and all credits and
deductions to which the decedent is entitled may be claimed. The link below is the IRS website to determine if a return is required.
I am sorry for your loss.
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