Hi Sacajaweau!
From the interviews I saw with people who knew her, he was controlling. And I suppose the drugs made her dependant on him.
Did you see the interview on Hannity where a decorator said that Stern never wanted anyone around her....he made sure she didn't have the same decorator or hairdresser or friends very long so she couldn't get "close" to anyone.
The whole thing reminds me of the Terri Schiavo case/