I'm sorry for your loss.
Leave it exactly as it is. If you change anything here, then you will flat out not be able to e-file the tax return.
Depending on when he passed, you may not be able to e-file it anyway. So you can expect the return to be rejected with something like an "SSN LOCKED" rejection message/code. This is common when e-filing a tax return on behalf of a deceased person. It indicates that those handling the final arrangements have done their job and notified the social security administration of their passing. Typically, the funeral home makes the necessary notifications.
If this turns out to be your case, then you have absolutely no choice but to print, sign and mail the return to the IRS. If a refund is due, then the IRS Form 1310 may (or may not) be needed. Get it at https://www.irs.gov/pub/irs-pdf/f1310.pdf if it turns out you need it.
