Jackson doctor's girlfriend called to testify

By ANTHONY McCARTNEY | October 4, 2011 | 1:35 PM EDT

Dr. Conrad Murray speaks with his attorney Ed Chernoff during his trial in the death of pop star Michael Jackson, Monday, Oct. 3, 2011, in Los Angeles. Murray has pleaded not guilty and faces four years in prison and the loss of his medical license if convicted of involuntary manslaughter in Michael Jackson's death. (AP Photo/Mario Anzuoni, Pool)

LOS ANGELES (AP) — Prosecutors have called the girlfriend of the doctor charged in Michael Jackson's death to detail the physician's schedule and her own interactions with the late King of Pop.

Nicole Alvarez told jurors hearing the involuntary manslaughter case that Dr. Conrad Murray had been treating Jackson for a year before his death. She says Murray introduced her to Jackson several times, including after the birth of the couple's young son.

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

Murray has pleaded not guilty in connection with Jackson's death.