In my country copyright is barely a thing.
There was a well-known voice-actor in my country who died several years ago. He spoke on so many advertisements and animations.
After his death one person was hired by the state TV to speak on advertisements without acknowledging. His voice was exactly identical to the deceased voice-actor. People first thought it's one of the last ads spoken by the voice-actor prior to his death. But after several months people realized it's an imitator (the ads were so new that the products being advertised didn't exist in the voice-actor's life).
No one knows the name of the new voice-actor at all. And no one has sued the state TV until now.
Even the voices of some living well-known actors/voice-actors are imitated in ads of the state TV. But the voices aren't identical. So people realize that's another person easily. Of course, imitating a living person's voice without acknowledging is again not good.
There are even singers who sing with the voices of well-known singers. It's also not good at all, because when the name isn't stated it's an act of impersonating and deceiving others.
Now this question came to my mind that if the same thing happens in a country like USA what happens? Is voice copyrightable after death? Can the state TV or the person imitating the well-known figure be sued? Will the law be in favor of the plaintiff in this case?