The process had begun in the writing of The Hobbit, in which there were already some references to the older matter: Elrond, Gondolin, the High-elves, and the orcs, as well as glimpses that had arisen unbidden of things higher or deeper or darker than its surface: Durin, Moria, Gandalf, the Necromancer, the Ring.
Some here will remember that many years ago I myself dared to pass the doors of the Necromancer in Dol Guldur, and secretly explored his ways, and found thus that our fears were true: he was none other than Sauron, our Enemy of old, at length taking shape and power again.
There are no more uses of "necromancy" in the book.
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suspected of necromancy
Necromancy might make their bodies move again, but their souls are gone forever.