A Judge has ordered the personal doctor of Michael Jackson to stand trial for involuntary manslaughter. Judge Michael Pastor gave the ruling against Dr Conrad Murray at a preliminary hearing in Los Angeles on Tuesday. Prosecutors say that Dr. Murray gave Mr Jackson a lethal dose of a powerful anesthetic mixed with other sedatives and then failed to provide proper care. Dr Murray, 57, has pleaded not guilty and says he did not give Mr Jackson anything potentially lethal. The cardiologist says he gave Mr Jackson the anesthetic Propofol to help him sleep. He was with the 50-year-old singer at the time of his death in June 2009. He faces up to four years in prison if convicted.