The IRS says it is going to ask for that money back. But the law says there cannot be clawbacks! So we will see how it works out. In the meantime, many banks are now refusing to accept stimulus deposits to the account of the deceased! So you have to mail it back.
Here’s an interesting article on the subject.
If you’ve already deposited the money it will be difficult to send back. So let’s see how this works out. Maybe when you file your tax return next year, you’ll have to declare the overpayment.