One doesn't raid a rogue's body parts, nor a gladiators, think of these things as things that fell away from the body at death if it helps you. If that doesn't work then think of your loot at things you snatched before the sentient being disappeared.
Things don't disappear(Can't be looted) from players because you would call that griefing . . .
True death is with poison, whether hung or decapitated if they don't come back, they were also poisoned. The other known things that cause true death are listed in the DR. There will be more and things will change as we need them to.