Mark-Kate Olsen Stonewalls FBI's Heath Ledger Inquiries

Anorexic actress Mary-Kate Olsen has refused to be interviewed by the FBI, which is probing the accidental drug death of her close friend Heath Ledger unless she receives immunity from prosecution, reports say.

According to the New York Post, the actress' lawyer has repeatedly rebuffed attempts by the feds to question Olsen - the first person called after her masseuse discovered Heath Ledger's lifeless body in his SoHo apartment.

Frustrated officials may go so far as to obtain a grand-jury subpoena to compel the fashion-challenged actress to talk about The Dark Knight star's behavior, his alleged drug use and the events of that fateful morning in January.

Officials have been interviewing everyone connected to Heath Ledger and his death, including doctors, the masseuse, bodyguards, maids, business associates and even the mother of his 2-year-old daughter, Matilda, Michelle Williams.

"Ms. Williams was extremely nice and cooperative," a source said. "In fact, everyone has been very eager to help, saying what a great guy Heath Ledger was, everyone except Mary-Kate Olsen, who has refused to speak."

Continue reading this article by the New York Post ...