Digital assets can range from items of financial value like online bank and brokerage accounts to domain names, Twitter accounts and social-media pages. Sometimes accounting for these assets after the death of the owner can be a nightmare. It becomes even more difficult if the decedent paid bills or filed tax returns on line. Without login information to access web accounts you may need to resort to hiring a computer forensics expert or obtain a court order for access to material.
Without access into the accounts of the decedent there is no way to stop automated bill payments or other automated services.
Suggestion: take inventory of all digital accounts and store a list of passwords and other necessary information on a flash drive. Put the drive in a safe deposit box or lock it in a safe. Remember to keep the inventory updated.