Indeed not, if the context that you want is not witnessing of the act but only seeing the body afterwards.I understood the point but it has little relevance given the context.
So given the context you want, please explain how a body which has been decapitated by a steel plate in an RTA looks different to one decapitated by a butcher with a warped mind.You knew what had happened to those people, as unfortunate as it was, it wasn't as a result of a butcher with a warped mind.