Seven months ago, Heath Ledger died of an accidental overdose. I don’t know what investigators have been doing since then, but on Wednesday, his case was officially closed. Prosecutors have decided not to look into how Heath got his hands on the illegal painkillers that caused his death.

The decision comes after recent reports that actress Mary-Kate Olsen was demanding immunity before answering questions about the startling death of her close friend and his drug use. Authorities say she was the first person called by a masseuse who found the 28-year-old “Dark Knight” actor’s lifeless body in his Manhattan apartment.

The DEA had obtained a subpoena that could have forced Olsen if she continued to hold out. But the subpoena, issued in April, is no longer valid because it was contingent upon prosecutors pursuing the case, the official said Wednesday. The official added that the case could still be revived if evidence of a crime emerges.

Mary-Kate Olsen must have blew everyone at the DEA. That’s the only logical explanation.