Dr. Paul Graham Fisher, a court appointed doctor, testified that 13-year-old Jahi McMath is brain dead on Tuesday, adding to previous confirmation from Children's Hospital doctors, according to the Associated Press.

Dr. Fisher, the chief of child neurology at Stanford University School of Medicine, is the second to conclude McMath as brain dead after she went in for a tonsillectomy surgery at Oakland's Children's Hospital on Dec. 12, the AP reported.

After reporting McMath was brain dead, hospital officials said they had no obligation to keep McMath on a ventilating system that is keeping her alive because there is no possibility she can come back from being brain dead. Keeping the ventilator on is also costing thousands of dollars a day, which health insurance will not likely cover, the AP reported.

The hospital filed court papers on Monday asking McMath be taken off life support after doctors said she was brain dead but her family wants to keep the ventilator on, until they can move her elsewhere and a third opinion is given, the AP reported.

Alameda County Judge Evelio Grillo has ordered for McMath to remain on life support until Dec. 30, or until further notice from the court, and is expected to consider the McMath's family request for a third opinion, according to the AP.

"It's wrong for someone who made mistakes on your child to just call the coroner ... and not respect the family's feeling or rights," Sandra Chatman, Jahi's grandmother and a registered nurse, said outside the courtroom on Monday, adding that she knows "Jahi suffered, and it tears me up," the AP reported.

The McMath family attorney, Christopher Dolan, asked Grillo to bring in Paul Byrne, a pediatric professor at the University of Toledo who was the co-editor of the book "Beyond Brain Death," which discusses the argument against current criteria used to determine if a person is truly deceased, the AP reported. Grillo denied the request on the terms Byrne is not a pediatric neurologist.

Byrne told the AP in a phone interview that if McMath's ventilator is properly functioning then that is a sign she is alive.

"The ventilator won't work on a corpse," Byrne told the AP, "In a corpse, the ventilator pushes the air in, but it won't come out. Just the living person pushes the air out."

Dr. David Duran, chief of pediatrics at the Children's Hospital, said though he offers his "deepest sympathy" for the McMath family, the child has been deemed brain dead adding a ventilator will not reverse the effects, according to the AP.

"The ventilator cannot reverse the brain death that has occurred and it would be wrong to give false hope that Jahi will ever come back to life," Duran said, the AP reported. He added her surgery was "very complex," and "not simply a tonsillectomy."