Mountain trail runner Hillary Gerardi says traversing perilous terrain as an elite “skyrunner” is where she and those dedicated to the sport feel most alive, but some routes have little to no margin of error.

The American-born athlete, who has been living in France for the last 15 years, says her close friend Kalie McCrystal of Squamish, B.C., remains missing on the Italian side of the Matterhorn, where she was last seen on Sept. 1.

Gerardi says she and another friend were set to help McCrystal attempt to break a running record last week, but when they realized no one had heard from her, they alerted authorities, but no trace of McCrystal has…

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