Conrad Murray, Michael Jackson's doctor, left, looks on as his attorney Ed Chernoff speaks during his arraignment at the Los Angeles Superior Court on charges of involuntary manslaughter in the singer's death in Los Angeles on Monday, Feb. 8, 2010. [Agencies]

LOS ANGELES – The doctor who prosecutors say caused Michael Jackson's death has been released from jail after posting $75,000 in bail, only a few hours after surrendering to authorities on a manslaughter charge.

Sheriff's Department spokesman Steve Whitmore says Dr. Conrad Murray was released Monday afternoon. Earlier in the day, he appeared in Superior Court and pleaded not guilty. He faces up to four years in prison if convicted.

Murray's lawyer says the doctor plans to return to his medical practices in Houston and Las Vegas while he awaits trial.

However, state officials say they plan to ask that the court suspend his medical license while he is free on bail.