NEW : `` They ( began ) CPR and , unfortunately , were not able to resuscitate the victims , '' Larson said . A fourth man died in an avalanche elsewhere in Idaho , his family says . Jim Brenan , Jim Jack and Chris Smith are killed in the Cascade Mountains . Professional skier Karen Saugstad credits an extra backpack for her survival . She recalls swiftly ` ` for more than a 2,000-foot ride down an avalanche ''
NEW : A fourth man died in an avalanche elsewhere in Idaho , his family says . Jim Brenan , Jim Jack and Chris Smith are killed in the Cascade Mountains . Professional skier Karen Saugstad credits an extra backpack for her survival . She recalls swiftly ` ` for more than a 2,000-foot ride down an avalanche ''