A Calgary family has come forward alleging negligence in the death of their nine-year-old daughter.

The target of the allegations is the Calgary Health Region and it could face another lawsuit.

It's a Global News exclusive story.

Savannah Chanthyvong died of septic shock following an appendix operation.

That's what also caused the death of Maren Burkhart nearly six years ago.

Maren's death sparked an inquiry, which made recommendations to avert tragedies like Maren's.

But Savannah's parents feel the death of their only daughter could have been prevented.

She died suddenly four months ago following an appendectomy at the children's hospital.

Her acute appendicitis brought on septic shock. Her body essentially shut down, and her parents never got the chance to say good-bye.

She initially complained of a stomach ache, and her parents took her to the Children's Hospital where she waited just over four hours before heading into surgery.

Following the rather routine operation, Savannah was recovering well, but nine hours after surgery, her condition started to deteriorate.

"They took her to the ICU room and after that everything started to become like a nightmare," Savannah's father Suki Chanthyvong told Global News.

Over the next several hours, Savannah had trouble breathing. Her lungs had filled with fluid and her kidneys were failing.

Efforts to save her failed. She passed away on May 15.

"They don't tell us nothing about Savannah's seriousness or danger," her father said. "They just said Savannah couldn't make it."

Her mother and father want to know why the medical staff didn't diagnose the septic shock before it was too late.

The Chanthyvong's are considering a lawsuit, but it has nothing to do with money.

"I think Savannah would love us to do this cause she wanted to save people's life to prevent this, so nothing will happen to someone else," he father said.

"Savannah wants to become like an angel. I know angels help people."

Septic shock is also killed 10-year-old Maren Burkhart in 1997.

She was suffering from an appendicitis and was also taken to the Alberta Children's Hospital.

A series of recommendations came out of an inquiry following her death.

The family sued the health region and two doctors, and the case was recently settled out of court.