Friendly PSA:
When a loved one passes leaving you the role of Executor of the estate, and you're going through who to notify about the recent death,
TELL THE BANK LAST!
They will freeze the account immediately upon hearing of the death and the only way to unfreeze it is to go through probate, which will take at least a month.
This is really important for things like online bill payments for utilities, mortgages, etc.