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Please clarify, did you sign the notarized letter?
Were you paid anything to sign the letter?
Was the condition you described mentioned at the time the money was placed in your account?
Then you are not guilty of fraud and the promise to not spend anything until after the death of the donor is not legally enforceable because it was not supported by any legal consideration.
An unconditional gift cannot have later conditions attached to it unless the donor pays the donee to obey the conditions.
In this situation the donee is clearly not committing fraud and the donor is being unreasonable.
I hope this information is helpful.
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You had an unrestricted legal right to use the money that had been unconditionally given to you.
Do you need any additional information?
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