The federal Drug Enforcement Administration office in New York has confirmed that they have issued a subpoena that would force Mary-Kate Olsen to testify in front of a grand jury.

Five medications were found in Heath's body at the time of his death, according to the DEA, three of which he'd obtained via doctors in Texas and Los Angeles. At the center of the investigation is how he acquired Oxycontin and Vicodin without a legal prescription.

The actress was the first person called by the masseuse who discovered Heath's body after the "The Dark Knight" actor's untimely death.

I am luvin' this! I don't know why there's so much secrecy comin' from MK, but it's all ovah now, bitch!

source