There are some examples of what you describe having occurred, of a person being declared dead and then their corporeal form being spotted later doing something entirely unrelated. This usually occurs because the person in question faked their death, often to avoid debts, get out of betrothals, or otherwise avoid unpleasant responsibilities.

If you believe this to have occurred with someone you know, your inquiry should more appropriately be directed to the Department of Magical Law Enforcement.

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   Lester Hatchitt