Conrad Murray...Michael Jackson's former doctor is now in custody... being held on $75,000 bail.Today in court the Houston cardiologist pleading not guilty to causing the pop star's death...just a few hours after he was charged with involuntary manslaughter.Murray was with 50 year old Jackson when he died June 25.After reviewing toxicology findings, the coroner ruled Jackson's death a homicide caused by acute intoxication of the powerful anesthetic propofol, with other sedatives a contributing factor.Officials say Murray administered propofol and two other sedatives to get the chronic insomniac to sleep.Murray's bail is three times more than what most people face for involuntary manslaughter charges.