sorry for your loss. you file form 1310.
here's a link to the form
you should not need to send will or POA
read the instructions on where to file.
with Turbotax you can not e-file the form.
either mail the return with form 1310 (must be signed)
or e-file the return and follow the instructions for where to file the 1310
https://www.irs.gov/pub/irs-pdf/f1310.pdf
