Dr. Murray's Girlfriend Subpoenaed to Testify Before Grand Jury

Sept. 22, 2009— -- The girlfriend of Michael Jackson's former personal doctor has been ordered to appear Wednesday before a grand jury in Los Angeles, according to a subpoena obtained by ABC News.

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Nicole Alvarez, the girlfriend of Dr. Conrad Murray, who remains the focus of a manslaughter investigation into the pop star's death, has been called as a witness "in an investigation pending before said grand jury," according to the subpoena. Jackson's June 25 death was ruled a homicide caused by drugs administered in Jackson's mansion by Murray, his personal physician.

A spokeswoman from the Los Angeles District Attorney's office declined to comment to ABC News about the subpoena but a law enforcement source confirmed that this subpoena is for an "investigative grand jury."

Alvarez is cooperating with law enforcement, said Joseph Low, her attorney. Low told ABC that the court refused to give him any information about what case Alvarez is supposed to testify about and what subjects might be covered. The court also refused to verify that the subpoena is even legitimate, given that it was unsigned and undated. "It's not usual for lawyers to have this much trouble getting information," he said. "They told me my client should just show up." A search warrant obtained by ABC News states that on August 13, 2009 police looked in Alvarez's home and a car registered to Murray's sister and retrieved a business card with Conrad Murray's name on it, a piece of paper, a receipt and a medical invoice.

Alvarez, who reportedly gave birth in March to Murray's seventh child, a baby boy they named Che Giovanni, is a resident of Santa Monica, Calif. She has reportedly been Murray's girlfriend since 2005 but is not clear from the documents how she plays into the manslaughter investigation into Murray.

It has been almost three months since Michael Jackson's death on June 25. While no charges have been filed in the case a manslaughter investigation is continuing and a preliminary report released by the coroner last month determined that the singer's death was caused by a lethal combination of prescription drugs.

The Los Angeles County Coroner's office released a statement saying the late King of Pop died because of acute propofol intoxication. The office cited benzodiazepine effect as another condition contributing to his death.

Propofol and lorazepam were cited as the primary drugs responsible for Jackson's death. The statement noted that other drugs detected in his system were Midazolam, Diazepam, Lidocaine and Ephedrine.

The coroner ruled the manner of death a homicide.

The coroner's announcement follows search warrants showing that police found marijuana and numerous empty drug bottles at Jackson's home shortly after he died.

Two bags of marijuana, a bottle of the drug temazepam, which is used to treat sleeplessness, empty bottles of the sedatives lorzaepam and diazepam were discovered during the search. Police also uncovered four more empty pill bottles with no sign of what they may have contained.

The warrants, which were served on June 29, also say that the day Jackson died, while investigators were at the house, "family members of the decedent notified Los Angeles County Coroner's Assistant Chief Ed Winter that they had located a quantity of tar heroin in [Jackson's] bedroom on the second floor of the residence. Winter notified LAPD detectives of the found evidence." The warrant fails to mention if the evidence really turned out to be heroin.

Another search warrant revealed that on the morning of his death, Jackson had "lethal levels" of the powerful anesthetic propofol in his blood.

According to the warrant,Jackson received a cocktail of painkillers and sedatives including the powerful anesthetic propofol.

Murray told investigators he had been treating Jackson for several weeks and had been trying to wean the singer off propofol by administering a series of prescription sedatives including lorazepam and midazolam.