From the passages below it is clearly stated that the Antichrist will be killed!

2Th 2:8  And then shall that Wicked be revealed, whom the Lord shall consume with the spirit of his mouth, and shall destroy with the brightness of his coming:

Dan 7:11  I beheld then because of the voice of the great words which the horn spake: I beheld even till the beast was slain, and his body destroyed, and given to the burning flame.

Isa 11:4  But with righteousness shall he judge the poor, and reprove with equity for the meek of the earth: and he shall smite the earth with the rod of his mouth, and with the breath of his lips shall he slay the wicked.

Yet in John it is stated that the Antichrist and false prophet are CAST ALIVE INTO THE LAKE OF FIRE!

Rev 19:20  And the beast was taken, and with him the false prophet that wrought miracles before him, with which he deceived them that had received the mark of the beast, and them that worshipped his image. These both were cast alive into a lake of fire burning with brimstone.

So what up with that?

Simple Biblical answer.

They both get killed at the fight at Armageddon.

They are resurrected for they have been judged and thus are the first 2 in history to be cast alive (Body, soul, and spirit) into the Lake of Fire.

The next person to get cast into the Lake of Fire is Lucifer a 1,000 years later.

Then the rest of all rebels. Angelic, demonic and human beings (Great White Throne Judgment)

Rev 20:10  And the devil that deceived them was cast into the lake of fire and brimstone, where the beast and the false prophet are, and shall be tormented day and night for ever and ever.

Rev 20:11  And I saw a great white throne, and him that sat on it, from whose face the earth and the heaven fled away; and there was found no place for them.

Rev 20:12  And I saw the dead, small and great, stand before God; and the books were opened: and another book was opened, which is the book of life: and the dead were judged out of those things which were written in the books, according to their works.

Rev 20:13  And the sea gave up the dead which were in it; and death and hell delivered up the dead which were in them: and they were judged every man according to their works.

Rev 20:14  And death and hell were cast into the lake of fire. This is the second death.

Rev 20:15  And whosoever was not found written in the book of life was cast into the lake of fire.