Investigators on Friday identified the 40-year-old San Antonio mother who died Thursday when she and her two daughters fell about 25 feet from a chairlift at Ski Granby Ranch.

Kelly Huber was pronounced dead at Middle Park Medical Center in Granby at about 10:45 a.m., where she was taken after the 9:30 a.m. fall. A ruling on her cause and manner of death is pending an autopsy scheduled for Saturday.

Grand County officials have yet to provide further details on how the Texas mother and her two young girls fell from the lift. Authorities say the case remains under investigation.

Huber’s 9-year-old daughter was taken to Middle Park before being flown by Flight for Life to Children’s Hospital Colorado. Her other daughter, who is 12, was treated at Middle Park and released. An update on the younger girl’s condition was not available on Friday, said Schelly Olson, a spokeswoman for the incident command.

Huber was vacationing in Colorado with her daughters and other family members, authorities say. It remained unclear Friday what prompted the fall, causing the first chairlift fall death in Colorado in 14 years.

Olson said Huber and her daughters were the only ones on the chair when they fell somewhere between the lift’s loading area and summit. The chair remained attached to the line.

Olson also said there were many witnesses: “People on the chairs in front. People on the chairs in back. People on the hill.”

Huber was a long-time employee of the health insurance provider Aetna, the company said.

“She was a loved and respected Aetna employee,” company spokeswoman Anjanette Coplin said in a statement. “Our thoughts are with all those affected by this tragedy.”

Chairlift deaths from malfunctions or falls are exceedingly rare in the United States, according to the National Ski Areas Association. Deaths from malfunctions have totaled just 12 from 1973 through October, and there were three deaths from falls between 2004 and October, the NSAA reports.

Rod Kessler, a ski area spokesman, said Thursday the three fell from the Quick Draw Express lift. The lift — a detachable quad, which is often called a “high-speed” lift — was shut down on Thursday “just to make sure everything is in order,” Kessler said. The lift remained closed on Friday.

The Grand County Sheriff’s Office and Granby Police Department are investigating, as is the Colorado Passenger Tramway Safety Board.

The board said Friday the lift “will remain closed until deemed safe for public operation,” but did not give an estimated timeline for when that process will be complete.

Ski Granby Ranch is about 20 miles west of Winter Park. The small, 400-acre family-oriented resort is known for being a spot for beginner skiers and snowboarders. It has just four chairlifts.

“All of us at Granby Ranch are deeply saddened by yesterday’s tragic incident at our resort,” the resort said in a Friday statement. “We extend our heartfelt condolences to the family of our guests. Our focus right now is on supporting those affected by this tragedy. … Granby Ranch is working cooperatively with authorities to determine the cause of the incident.”

The last chairlift fall death in Colorado is believed to have occurred in 2002.

According to an October report by the NSAA, the last death on a chairlift attributed to a malfunction was in 1993. As of the 2015-16 ski season, the annual fatality rate per 100 million miles traveled on ski lifts was 0.14.

In 1976, two cars from Vail’s 7-year-old gondola – each carrying six skiers – plummeted 125 feet, killing four people in one of the most deadly lift incidents in the United States. In 1985, a bullwheel at Keystone Resort failed, sending waves down the line that threw 60 people off the Teller Lift, two of whom later died from their injuries.

In April 2009, a Rhode Island man with no significant medical history died after losing consciousness on a chairlift in Breckenridge. Attempts to revive him at the top of the lift were unsuccessful.

In January, a skier pushed a snowboarder off an Aspen Highlands chairlift. Thomas Proesel, who was accused of first-degree assault in the case, was found not guilty by reason of insanity. The snowboarder was not seriously hurt.