That person's Estate would have to file an Estate Income Tax return (Form 1041, not 1040) for 2020.  That requires the TT Business desktop version (Windows version only):

TurboTax® Business CD/Download 2020-2021 Desktop Software, File Business Taxes (intuit.com)

Also see:

Deceased Taxpayers – Filing the Estate Income Tax Return, Form 1041 | Internal Revenue Service (irs....

@phinzman1285 

You need to be cautious with this since cancellation of indebtedness (COD) can result in taxable income, and the debtor is now deceased.

You should consult, in person, with a local tax professional (or legal counsel).