One. Unless the replacement is also dead, then it is none. It doesn't state if the one that is replaced is replaced with a live or dead person.
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Ans is 2 people. You must be little clear whether replaced is also dead one or alive if alive its 1.
It's impossible to replace a person. There are still 2 dead people.
questions that dont make sense are rarely fun
fun way to give 10 free points for the first right answer