Closed Captioning ON OFF apply | reset x Text Display Background Enhancements font Times New Roman Arial Comic Sans size T T T T color share link June 8th, 2013 Exclusive look: Man to walk over Grand Canyon Nik Wallenda is taking on the biggest challenge of his life: tightrope-walking above the Grand Canyon without a harness. More video Sponsored Content Now Playing Disney Removes Cosby Bust Sponsored Content Now Playing If Dragons Were Real Could You Actually Ride One? Sponsored Content Now Playing Great Escapes: From 'Shawshank' to 'X-Men,' Pop Culture's Top Prison Breaks Sponsored Content Now Playing Why Do We Love Zombies So Much? NBC News Drupal Now Playing Nightly News Full Broadcast (July 30) Now Playing California Firefighters Hold Line Against Wildfires Amid Extreme Heat Now Playing Bears Arrive At New Home Now Playing Why Cecil's Death Is About More Than One Lion TRENDING Now Playing Tom Hanks wrote letter inviting director to 'discover' him at age 18 Now Playing One Direction's Zayn Malik signs record deal to make 'real music' Now Playing Friends stuff sleeping pal's mouth with Twizzlers Now Playing Key & Peele's 'Sports Center' for teachers goes viral Most Watched Now Playing Sponsored Content MH370: Is debris near Madagascar from the missing plane? Now Playing Sponsored Content Jane Birkin to Hermes: Take my name off crocodile bag Now Playing Sponsored Content Dentist who killed Cecil the lion faces growing backlash, protests Now Playing Sponsored Content Rossen Reports: What are your rights during a traffic stop? Now Playing Sponsored Content Milwaukee plane crash kills 2 after failed landing attempts Now Playing Sponsored Content J.C. Penney worker sent home for wearing shorts bought... at J.C. Penney Now Playing Sponsored Content What charges could Walter Palmer face for killing Cecil the lion?