The Feds want to grill Mary-Kate Olsen about the death of Heath Ledger, but she won't spill the beans – unless she gets protection.
Which brings up the question: What does she know? The New York Post says the celebutwin has "repeatedly rebuffed attempts" by Federal investigators to question her what happened on the day of Heath's death. She was one of the first people called after Ledger was found unconscious in his SoHo apartment.
Feds have spoken to everyone else connected to the death, including the mother of his daughter, Michelle Williams.
