An Arizona State University student is dead after she fell while rappelling from a cliff in the Tonto National Forest.

The Maricopa County Sheriff's Office says the 21-year-old woman was rappelling in Coon Bluff, a popular recreation area near the Salt River, on Saturday morning when the incident occurred.

Sheriff's Office spokesman Chris Hegstrom says she fell about 125 feet and was unresponsive. Despite life-saving efforts by deputies, she was pronounced dead.

Authorities say the woman was part of a group of 20 climbers from ASU. They also say she was the daughter of a Phoenix police lieutenant.

Investigators are looking into the cause but say it appears to be accidental.