The last person to see Michael Jackson alive has been charged with involuntary manslaughter in the pop king's death, ending months of speculation and legal wrangling. 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.

Murray pleaded not guilty to the charges, according to TMZ. Bail was set at $75,000 and the doctor is expected back in court in April.