A 68-year-old woman died after falling into rapids while on a boat tour in Grand Canyon National Park on Thursday, according to the US National Park Service.

The woman has been identified as Mary Kelley of Steamboat Springs, Colorado. According to a park service report, the incident happened on the ninth day of a private boat trip. The park service said Kelly “entered the river at the top of Hance Rapid.”

The park described the Hance Rapid as a “very technical and powerful whitewater rapid” at the intersection of the Colorado River with Red Canyon. After the incident, Kelley was pulled from the river by members of her travel party. She was unresponsive and CPR was administered before emergency crews arrived.

The park service confirmed it happened on the Colorado River after the park received an emergency alert by a personal locator beacon during a non-commercial river trip on March 24 at 11:18 a.m.

Authorities said they believe Kelly entered the river at the top of Hance Rapid where Red Canyon intersects the Colorado River at mile 77 of the river.

An investigation by the Parks Department and the cause of the woman’s death are still under investigation by the Coconino County Medical Examiner.

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