Mary-Kate Olsen is refusing to talk with federal investigators about the death of Heath Ledger—unless she’s given immunity—reports People magazine.

The 22-year-old starlet was the first person called when her masseuse discovered “The Dark Knight” star’s body.

According to a report in the New York Post, Olsen’s lawyer has rejected several attempts for the actress to be questioned— which may lead the former “Full House” star to be subjected to a grand-jury subpoena to discuss what she knew about Ledger’s life and death.

“Everyone has been very eager to help, saying what a great guy Heath Ledger was, everyone except Mary-Kate, who has refused to speak,” a source said.

Ledger died in January due to an accidental overdose of prescription medication. His latest and final acting role as The Joker in “The Dark Knight” has earned him Oscar buzz.






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