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In Illinois, a will must be in writing and must be signed by the testator (the person making the will). The will must also be witnessed by at least two other people (three if any of the witnesses signing are also beneficiaries). Therefore, a handwritten will, often called a "holographic" will, is valid in Illinois provided that it is witnessed and signed by at least two people.
If the will was not witnessed, it is not valid, and the old will would still control.
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