Climbing star, 23, dies after falling from Yosemite's El Capitan
Details of what caused the incident are not clear, but Miller's brother Dylan told AFP he was lead rope soloing - a technique that enables climbing alone while still protected by a rope - on a 2,400ft (730m) route named Sea of Dreams.
In an emotional social media post confirming her son's death, his mother Jeanine Girard-Moorman said: "My heart is shattered
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