How can Elijah be one of them?   John the Baptist was Elijah according to   

(Matthew 11:13-14) - "For all the prophets and the Law prophesied until John. 14"And if you care to accept it, he himself is Elijah, who was to come."

So if it is appointed for all men to die once, then Elijah finally died when John the Baptist died.  How then can he be one of the witnesses?

If this has been answered already, I'm sorry I must have missed it.  Could someone please help me with this!!

Thanks, Susanna