Alan Duke
CNN

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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[cnn-photo-caption image=http://i.cdn.turner.com/cnn/2011/CRIME/01/05/california.conrad.murray.hearing/t1larg.conrad.murray.gi.jpg caption="Dr. Conrad Murray remains free on a $75,000 bond. A pretrial hearing is expected to last two or three weeks." width=300 height=169]

Alan Duke
CNN

Los Angeles (CNN) - Michael Jackson's two oldest children, Prince and Paris, watched from a bedroom doorway as Dr. Conrad Murray tried to revive their father, according to a security guard.

"Paris screamed 'Daddy!' and she started crying," Alberto Alvarez testified at a preliminary hearing for Murray, who is charged with involuntary manslaughter in Jackson's death in June 2009.

Michael Jackson's parents, three sisters, and brother Randy listened from the second row of the Los Angeles County courtroom as Alvarez, apparently near tears, described the scene.

"Dr. Murray then said 'Get them out, get them out. Don't let them see their father like this,'" Alvarez said. "I turned to the children and I told them 'Don't worry, children, we'll take care of it. Go outside please.'"

The Los Angeles Superior Court preliminary hearing, which began Tuesday, is expected to last two or three weeks, with 20 to 30 witnesses testifying. Judge Michael Pastor will determine whether there is probable cause to send Murray to trial.

On Tuesday, Jackson's former security chief testified that Murray seemed not to know how to administer cardiopulmonary resuscitation as he waited for paramedics to arrive at the singer's house.

Faheem Muhammed said he and Alvarez saw Murray crouched next to Jackson's bed "in a panicked state asking, 'Does anyone know CPR?'"

"I looked at Alberto because we knew Dr. Murray was a heart surgeon, so we were shocked," Muhammed said.

When defense lawyer Ed Chernoff asked if perhaps Murray was only asking for help because he was tired, Muhammed said, "The way that he asked it is as if he didn't know CPR."

Jackson appeared to be dead at that time, with his "eyes open and his mouth open, just laying there," Muhammed said.

Los Angeles County Deputy District Attorney David Walgren earlier said that Murray used "ineffectual CPR with one hand while the patient was prone on a soft bed." Using two hands with the patient prone on a hard surface is the proper method, he said.

Muhammed, the third witness on the opening day of the hearing, said he never saw Murray performing CPR on Jackson before paramedics arrived and transported the singer to Ronald Reagan UCLA Medical Center.

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