[IAmBroom]

In Demon, the third in John Varley's Gaia trilogy of sci fi books, the (alien-manufactured) "zombies" were animated by colonies of worms that fed on the soft tissues of the corpse, and simply replaced the actions of the lifeless muscles. They thus had very human outlines, and if anything, far more horrifying looks than half-rotted corpses.

They also didn't last very long; they were meant as disposable remote-controlled troops.