Once your spouse has passed away it is important to update any legal documents and accounts accordingly. This includes changing the name on titles such as car registrations, deeds to property, bank accounts and credit cards in their name, notifying utility companies and other institutions of the death so that no bills or payments are sent out after the death, updating passwords and usernames associated with online banking accounts, and transferring any ownership rights over jointly owned property if necessary. Additionally, you may need to look into applying for government benefits like Social Security Death Benefits as well. It is important to consult a lawyer or financial planner if you need help with any of these steps.