Can I do a 2017 tax return using turbotax for someone who passed away in 2019?
I am sorry to hear of your loss.
Yes, you can do tax returns for previous years for individuals who have passed away. Just remember that they were still alive then, so it asks you if the person has died, answer No. You only need to put the date of death on the person’s final return, which in your case would be 2019.