I am sorry for your loss.
In
order to file a return for the deceased, you will need to create another
account as one is necessary to file another individual tax return in
TurboTax Online, but you can use your email address to create the other
account, you will just choose a different User ID and password. For
instructions on how to do so, please see the following TurboTax FAQ:
https://ttlc.intuit.com/replies/3288574
Please see the following TurboTax FAQ for more
information on filing a decedent return:
https://ttlc.intuit.com/replies/3300219