Olsen wants police immunity before talking on Ledger

US GOVERNMENT investigators want to question actress Mary Kate Olsen about how Heath Ledger got two painkillers that contributed to his overdose death, according to a law enforcement official.

But the official said Olsen’s lawyer had twice refused requests to have her sit down with investigators probing the death of Ledger, who co-starred in the new Batman film, The Dark Knight.

The official, who spoke anonymously, says she wants immunity before she speaks to drug agents. The official confirmed a New York Post report that Olsen — a close friend of Ledger who learned about the 28-year-old Australian’s death in January in a frantic phone call from a masseuse — wants a promise of immunity before she speaks to the Drug Enforcement Administration (DEA).