Who is Kalie McCrystal, the Canadian trail runner missing under Tyndall Peak?

Kalie McCrystal, a 38-year-old Canadian trail runner and member of the Athletics Canada national team, has been missing since September 1 on the Italian side of the Matterhorn. She was last seen descending near Tyndall Peak by a group of Polish climbers. Italian authorities have launched search operations, including helicopter rotations, but have found no results so far. Her family remains in contact with the rescue teams, while investigators are examining a second SIM card she was carrying.