I need to amend my 2019 because the taxpayer died prior to submitting tax return and I did not show that.

[PattiF]

If you are filing the amended return, you can follow the instructions here.

Be sure to mark the box in the personal information you are filing on behalf of a deceased individual. 

When you file the amended return, it will provide you all the instructions with what you need to send in (if anything). 

{Edited 02:02 PST, 02/25/2021}