Dean Potter, seen here in 2012, died this weekend along with Graham Hunt while they were attempting a wingsuit flight in Yosemite National Park in California. Hao Tongqian/Xinhua /Landov hide caption

itoggle caption Hao Tongqian/Xinhua /Landov

The story of Arthur, a stray who adopted a team of Swedish athletes competing in Ecuador, spread quickly after he refused to be left behind. Krister Goransson/Peak Performance hide caption

itoggle caption Krister Goransson/Peak Performance

Nicholas Mevoli in a video, posted in in August. He talked of his love for freediving. On Sunday, Mevoli died after trying to set an American record. YouTube.com hide caption

itoggle caption YouTube.com

In 2012, these two base jumpers wearing wingsuits were high above Chamonix in the French Alps. Cyril Duval/AP hide caption

itoggle caption Cyril Duval/AP

A runner tries to escape with his life as zombies pursue him during the Run for Your Lives race. The 5K course is littered with obstacles — and the undead. HGL hide caption

itoggle caption HGL