Police in Graubuenden canton (state) say the avalanche on the slopes of the Piz Vilan mountain Saturday afternoon swept away seven members of a nine-strong group of skiers.
Rescuers recovered three bodies and four seriously injured people, who were flown to hospitals in St Gallen, Zurich and Chur. Police say a fourth person later died at a hospital.
There was no immediate word on what triggered the avalanche.