"The French Olympic team is mourning one of its own after Julie's tragic disappearance," the committee wrote on Twitter.
Pomagalski finished active in 2007, after, among other things, taking World Cup gold in snowboardcross in 1999 and finishing sixth in parallel slalom at two Olympics (2002 and 2006).
Another person also died in connection with the avalanche on Mount Gemsstock.
Julie Pomagalski turned 40 years old.