Does revocable trust become irrevocable at death?

Does revocable trust become irrevocable at death?

A revocable trust turns into an irrevocable trust when the grantor of the trust dies. Typically, the grantor is also the trustee and the first beneficiary of the trust. Once the grantor dies, the terms written into a revocable trust cannot be modified in any way, nor can anyone add or remove assets.

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