I assume you are referring to the unlimited money glitch where
you can take the gold from his body over and over again. The game
is programmed so that when you kill an npc, after you leave, the
body disappears. However this depends on how remote the area is,
which is suppose represents the chances of somebody stumbling over
the body and moving it. Back to Dorian. If you kill him and his
body disappears then it's gone for good. You can't get it back and
it hasn't actually been "moved". It just vanishes from the game.
Sorry mate.