There, in a picture-perfect moment captured on an iPhone, photographic evidence of that ominous adage: life can change in an instant. Lorna White standing in a stream, looking up at her hiking companion, frothy alpine waters gurgling at her feet. “Stay right there,” her friend, Krista, had instructed on that sunny Sunday in 2015. “That’s a great photo.”White smiled. Krista got the shot. White turned around to resume the hike out of the Purcell Mountains, intending to drive back to Calgary that night.