On Thursday it emerged that Dr Conrad Murray’s legal team had backtracked on their main defense claim.
And now Michael Jackson’s former cardiologist has received a further blow in his involuntary manslaughter trial.
Sleep therapy expert, Dr Nader Kamanger, described Dr Murray's treatment of the pop star as "unethical, disturbing and beyond comprehension".
He said the use of a cocktail of drugs to help Michael Jackson as he struggled to fall asleep was a "recipe for disaster" and ultimately caused his death.
Dr Kamanger was the third expert for the prosecution to criticise Dr Murray's conduct.
He added that the heady mix of the drugs Valium, Ativan and Versed were given to the star during a 10-hour period.
The testimony comes after Dr Murray's defense team announced it was dropping the centerpiece of their case - that Michael swallowed additional Propofol when the accused was out of the room.
The cardiologist denies the charges against him.
If convicted, he could face up to four years behind bars and the loss of his medical license.
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