Keystone, CO – A 20-year old woman died last Wednesday while night skiing at Keystone Resort in Colorado.

Authorities say that Doae Oh, a college student from Austin, Tex., was skiing on the resort’s Frenchman run on Dercum Mountain around 6:30 p.m. on Wednesday when she lost control and struck a tree. She was reportedly not wearing a helmet.

Oh was evacuated to St. Anthony Keystone Medical Clinic, where she was pronounced dead from her injuries.

The incident that killed Oh occurred only hours after a similar accident at nearby Winter Park Resort that left a 20-year-old University of Kansas coed hospitalized in serious condition after colliding with a tree.