Two important things:
1) It's not Amrod that dies in the Third Kinslaying - it's Amros (previously called
Amras)! Tolkien switched the birth order of the two when he came up with the 'Feanor burning his youngest son' story.
2) Maglor is supposed to
die by throwing himself into the sea in the later conceptions. Examples:
Quote:
The last two sons of Fëanor, compelled by their oath, steal them, and are destroyed by them, casting themselves into the sea, and the pits of the earth.
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The Letters of J.R.R. Tolkien, 'Letter 131' (from c. 1951)
also
Quote:
No other player has there been, no other lips or fingers seen so skilled, 'tis said in elven-lore, save Maelor son of Fëanor, forgotten harper, singer doomed, who young when Laurelin yet bloomed to endless lamentation passed and in the tombless sea was cast.
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The Lays of Beleriand, 'The Lay of Leithian Recommenced', p. 353 (c. 1950)
and lastly
Quote:
But the last surviving sons of Fëanor (Maedros and Maglor), in a despairing attempt to carry out the Oath, stole them again. But they were tormented by them, and at last they perished each with a jewel: one in a fiery cleft in the earth, and one in the sea.
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Concerning...the 'Hoard' (c. 1964)