doesn't know where Heath Ledger
got the drugs that killed him, and she has already provided investigators with "relevant information," her lawyer says in a statement.
"Despite tabloid speculation, Mary-Kate Olsen had nothing whatsoever to do with the drugs found in Heath Ledger's home or his body, and she does not know where he obtained them," said the statement from attorney Michael C. Miller on Monday.
The statement was released following a report, confirmed by PEOPLE, that Olsen, 22, wants immunity
from prosecution before she will cooperate with a federal investigation into close friend Ledger's death from an accidental overdose.
"Regarding the government's investigation, at Ms. Olsen's request, we have provided the government with relevant information including facts in the chronology of events surrounding Mr. Ledger's death and the fact that Ms. Olsen does not know the source of the drugs Mr. Ledger consumed," the statement from her attorney continues.
The statement concludes: "We don't know the source of the information being quoted in the media regarding the government's inquiry, but these descriptions are incomplete and inaccurate."