Can I sign a tax return for my deceased father?

Question Details: My father is 100% shareholder of an LLC that files 1120's tax returns. He has me listed on the state site as mgrm along with his name and my brother's. He passed away recently without filing his tax return for last year. He did not have a Will and I have not been assigned officially by the court as the executor or administrator of the estate yet. Can I sign the corporate return so that the return can be processed timely?

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