One thing is for sure he is creepy just to look at. His eyes are dead and he looks so cold. He knows he isnt the father, thats why he hasnt given up any dna. That baby is his token to the rich life. If it was a drug over dose which is what it seems it would be, I think Stern knew and just turned a blind eye. He knew it had to be only a matter of time before she kicked the bucket from all the abuse if thats what was going on . SO he enabled her and then just waited for her to destory herself with grief and drugs.