You may file jointly. There is a box to check in your spouse's information that they passed away and a place to indicate the date. You may not be able to e-file, either due to a bug in Turbotax (this is unclear) or because the IRS routinely blocks the SSNs of deceased taxpayers to reduce fraud. If you can't e-file, print your return, sign in your space and your spouses space with "personal representative" and mail the return.
