Back in August 2015, two high school students were asleep in a tent in the Upper Pines Campground when an oak limb fell, killing them both. And in 2012, a concessions worker was killed when a tree fell on his tent cabin during a windstorm.

Angela Lin, 29, was out with her boyfriend in the Tuolumne Grove area of the park on the afternoon of July 19 when the incident occurred

The trails of Tuolumne Grove, a popular site in Yosemite National Park, wind through forests of pine and giant sequoias, the largest trees on earth. On July 19, after hiking about a mile into the grove, Angela Lin, 29, and her friends heard a snapping sound above them.