The U.S. Attorney's Office won't need Mary-Kate Olsen to testify because it has closed its investigation into how Heath Ledger obtained painkillers which contributed to his death. Rumors swirled about MKO's involvement and how she would only talk if given immunity, leading her lawyer to proclaim, "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" and that she had cooperated with the government. A source summed up the feds' interest in the actress to the Daily News, "We don't know where [Ledger] got the other narcotics. No one interviewed suggested (Olsen) gave him the drugs. But (Olsen) may have known where the drugs came from."