Los Angeles (CNN) - The prosecution's expert witness in the case against Dr. Conrad Murray admitted Tuesday he made a math mistake and that the recalculation supports the theory that Michael Jackson may have given himself the fatal dose of propofol.
Propofol is a surgical anesthetic that the Los Angeles coroner ruled killed Jackson in combination with several sedatives found in his blood.
Dr. Richard Ruffalo, an anesthesiologist hired by the prosecution, was the last witness before both sides rested in the preliminary hearing, held to decide if the involuntary manslaughter charge against Murray will go to trial.
Los Angeles County Superior Court Judge Michael Pastor is expected to announce his decision later Tuesday.
"I actually made a mistake on that," Ruffalo said during cross-examination, referring to his calculation of the levels of propofol in Jackson's stomach fluid.
The admission drew an audible gasp from Jackson family members sitting in court.
Murray's lawyers suggest a frustrated and sleepless Jackson may have poured the surgical anesthetic propofol into his juice bottle while the doctor was out of his bedroom.
"Now it doesn't make sense unless he ingested it orally in a huge amount," Ruffalo testified.
But he said Murray would still be at fault, because he left dangerous drugs near a patient who was addicted.
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