NEW YORK - A Los Angeles jury Monday found Michael Jacksons personal doctor of guilty of involuntary manslaughter in the death of pop star Michael Jackson, according to media reports. The verdict against Dr. Conrad Murray, 58, came after 8 1/2 hours of deliberation, following a six-week trial. He was led away in handcuffs after the jury in Los Angeles reached a unanimous verdict. Dozens of fans outside the court erupted in cheers and some burst into tears. Justice was served. Michael is with us, said Jacksons brother Jermaine. Murray faces up to four years behind bars when he is sentenced on November 29 but may spend only months in Los Angeles overcrowded cells. Murray pleaded not guilty to giving the Thriller singer a fatal dose of the powerful anesthetic propofol normally used in surgery that was ruled the main cause of his death at the age of 50. Prosecutors argued Murray was grossly negligent in administering the propofol to help Jackson sleep. Defence lawyers claimed Jackson delivered the fatal dose to himself. The judge ordered Murray, who had been free on bail for two years, held in custody until his sentencing. The doctor did not testify at the six-week trial and looked impassive as the guilty verdict was announced in the packed courtroom. Jacksons mother Katherine and sister Rebbie cried silently at the result. Other family members in court included his siblings La Toya and Randy, along with his father Joe. I am, Katherine Jackson said when reporters asked if she was pleased with the verdict. Jackson was found lifeless at his Los Angeles mansion on June 25, 2009, about three weeks before he was due to begin a series of concerts in London aimed at returning him to the limelight after the humiliation of his 2005 trial and acquittal on child molestation allegations. Murray admitted giving Jackson a small dose of propofol to help him sleep. But his lawyers argued the singer was dependent on the drug and likely gave himself an extra, fatal dose and swallowed a handful of sedatives without Murray knowing.