COLORADO SPRINGS, Colo. Jim Johannson, a longtime USA Hockey executive and U.S. Olympic mens hockey general manager, died unexpectedly Sunday at age 53, shocking the sport less than three weeks before the start of the Pyeongchang Games.

Johannson died away in his sleep at his home in Colorado Springs, according to USA Hockey. His death came in the midst of the most high-profile role in his career: putting together the American Olympic mens hockey team without N.H.L. players going to South Korea, a position he relished after doing so at several world junior and world championships.