not Susan. You are right, it was by Stefano’s instructions, but there are suppositions that perhaps Susan dressed to appear as Kristen and inject E.J. with something that would preserve him. However, even though I thought about it, I think it is highly unlikely. Besides, if it was Susan, why would the writers have Stefano telling Kristen that E.J.’s body had “arrived” and he was where he should be. There is not even the slightest chance Susan would allow Stefano to have anything to do with E.J.’s body.