If an individual was excommunicated and then later died, can sealing ordinances be done for that individual? If so, is there a waiting period?
With First Presidency approval. See the General Handbook (https://abn.churchofjesuschrist.org/study/manual/general-handbook/28?lang=eng#title_number12) section 28.3.8.
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I did this for my great grandfather back in the 80's. Very sweet.