HUNTINGTON BEACH, Calif. -- A 50-year-old woman from Huntington Beach was killed in a freak snowboarding accident after she became stuck head-first in a creek.

It happened while Mary Scott King was heli-skiing with her boyfriend Saturday in the Mineral Creek Basin near Telluride, Colorado. King was following a group of skiers downhill when she fell into a creek and her helmet became stuck between two rocks, according to the San Miguel County Sheriff's office.

Two guides tried to rescue her, and about ten minutes later she was pulled her from the creek, lifeless. She was pronounced dead at the scene.

Sheriff's officials say King was not a beginner at snowboarding. They called the incident a "freak accident."

Responders weren't sure whether King died of blunt force trauma or drowned, however, the incident had all the indications of a drowning, according to San Miguel County Sheriff Bill Masters.

Heli-skiing involves delivering skiers to the top of the mountain by helicopter, rather than a ski lift, giving them more of a backcountry experience.