I am sorry for your loss.
You would go to the income and expenses part of your return to the line showing the business and go to view or review and then go in and answer the questions that you no longer have the business and should be able to delete it or show no income or deductions on it to remove it from the return.
However, if assets from that business that have been deducted on your returns are sold, then they must show as sold on the 4797of the return and subject to ordinary income tax.
[Edited 03/02/2021|6:36 pm PST]