Anthony Seibert, 24, grandson of Vail's co-founder, Peter Seibert, Sr., died in an avalanche while skiing on Tuesday, Jan. 7. Seibert grew up in Colorado, but the avid free-style skier spent time on the mountains of Park City and graduated from the Winter Sports School in 2007.

Dave Kaufman was not yet Head of School while Seibert was a student, but he said his death has sent shockwaves through the Winter Sports School community. The first Kaufman heard of Seibert's death was through a post on Facebook by Alex Schlopy, a former student and friend of Seibert.

"Unfortunately, I did not know Seibert personally," Kaufman said. "But every time we lose a member of the family, whether I've met them or not, it shakes people up and it's a sad time."

Park City resident Hughes Martin was devastated by the news of Seibert's death. The enthusiastic skier lived with the Martins for a year while attending the Winter Sports School. Martin's son Carter also attended the school, which is geared for competitive snow sport athletes, and they became fast friends. Martin said the boys also shared a special connection both were twins.

"They hit it off immediately. He was outgoing and liked by many kids in Park City. He really understood what we were about; he got it," Martin said.

Seibert was in a group with three others when the avalanche hit, and the others who were not identified were rescued and treated for minor injuries, The Denver Post reported.

He is survived by his parents, Peter Seibert, Jr. and Teri Salani Seibert, his twin sister Anna, brother Petey and younger sister Lizzy.