04/10/2011 15:42 BST | Updated 04/12/2011 05:12 GMT

Dr Conrad Murray's Girlfriend Quizzed In Trial Over Michael Jackson Death

Prosecutors have called the girlfriend of the doctor charged over Michael Jackson's death to detail the physician's busy schedule on the day the singer died.

Nicole Alvarez told jurors during the manslaughter trial of Dr Conrad Murray that the doctor had first told her that he was Jackson's personal physician for a year before the singer's June 2009 death.

Ms Alvarez beamed as she described meeting Jackson for the first time in Las Vegas, where Murray maintains a medical practice. "I was speechless," she said. "I couldn't believe I was meeting Michael Jackson."

Ms Alvarez said she and Murray met Jackson several other times, including after the birth of the couple's young son.

She said after April 2009, Murray would frequently leave her apartment at night and return early the next day. She said she knew Murray was working as Jackson's personal doctor while the singer prepared for a series of comeback concerts.

Phone records displayed in court on Monday showed Murray called Ms Alvarez four times on the afternoon of Jackson's death in 2009, including once while he was in the ambulance with the star's lifeless body on the way to the hospital.

Prosecutors are keeping jurors focused on the doctor's phone records from the day Jackson died, attempting to show that Murray was trying to juggle his medical practice, personal life and superstar patient at the same time.

Authorities contend he gave the singer a lethal dose of the anaesthetic propofol and other sedatives. Murray's lawyers claim Jackson gave himself the fatal dose.

If convicted, Murray faces four years behind bars and the loss of his medical licence. He has pleaded not guilty.