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LOS ANGELES (AP) -- Michael Jackson's doctor has been charged with involuntary manslaughter in the pop singer's death.

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Prosecutors announced the charge Monday against Dr. Conrad Murray, a Houston cardiologist who was with Jackson when he died June 25. He faces up to four years in prison if convicted.

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Murray's attorney Ed Chernoff says Murray will plead not guilty.

Jackson hired Murray to be his personal physician as he prepared for a strenuous series of comeback performances in London.

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Officials say the singer died in Los Angeles after Murray administered the powerful general anesthetic propofol and two other sedatives to get the chronic insomniac to sleep.