One of the other men was injured, and the third was not hurt.
The avalanche was reported around 12:30 Thursday. Mineral County Sheriff Fred Hosselkus says three men from New Zealand had been skiing in the area for a couple of days.
"They weren't completely unfamiliar with the area," Hosselkus said. "We were on scene just 20 minutes after the call."
The man who was killed was a member of the Keystone Ski Patrol. One of the other men was also a member of the ski patrol.
The names of the victims haven't been released because the families have not yet been notified.
Avalanche experts say the danger is throughout the state because Colorado has not seen much snow this season.
The Colorado Avalanche Information Center is encouraging skiers to ski on a 30 degree-angled slope or lower and to check the avalanche forecast before heading to the mountain.
Avalanche danger is expected to remain high through the end of the ski season.
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