Heath Ledger Investigation Dropped By DEA

The investigation into Heath Ledger's death is officially case closed - the high-profile probe was closed abruptly without no charges being filed.

Mary-Kate Olsen had just been subpoenaed by a federal grand jury, but her attorney had been in negotiations with federal authorities since.

The actress was expected to be a part of a DEA investigation into Ledger's death earlier this year - after Ledger's masseuse found his dead body, she used the star's cell phone to dial MK three times before hitting up 911.

But with the case officially closed, Olsen's now off the hook. She must be so relieved. She'll probably start eating regularly now. Oh wait ...

On a related note, sources connected with the Heath Ledger investigation say the Drug Enforcement Administration set a new low with its conduct.

How's this for starters ... no one connected with the case can point to a single other DEA case where a massive investigation was launched over an accidental death in which no criminality was evident - or even hinted at.

Follow this link to continue reading TMZ's investigation into the DEA investigation and power grab, it's pretty surprising ...