The jury hear evidence that MJ had also taken a large number of sleeping pills… 08:42, Sunday, 30 October 2011 The last defence witness in the trial of Dr Conrad Murray, Michael Jackson’s personal physician, has told the courtroom that he believed the star was responsible for his own death.   Dr Paul White told jurors that the most likely cause of death was self-injection of a fatal dose of the anesthetic Propofol, after Murray had already administered a small amount. "With the administration of the additional 25 milligrams that we're speculating was self-injected by Mr Jackson, the level increases rapidly and at the time of death would be almost identical to the level found in the urine at autopsy," Dr White said. He revealed that the superstar also appeared to have taken a large dose of sedatives – eight Lorazepam tablets – earlier in the night without Murray’s knowledge. White said that mixing the two drugs would be deadly. "The combination effect is potentially profound." Earlier this week a specialist testified that Michael may have also been addicted to the painkiller Demerol, and was also a regular user of Botox. Murray is charged with involuntary manslaughter into the star’s untimely death in June 2009. The prosecution has already presented four weeks of evidence so it won’t be long before the jurors retire to decide the verdict. Michael’s sister Janet Jackson recently postponed tour dates in Australia in order to be in LA when the verdict is announced. She explained her decision in a statement: "When I planned these shows, the schedule in California was completely different. After talking with my family last night, I decided we must be together right now.”