Multiple sources connected to Strange tell us Johnny was in Switzerland -- where something went wrong during his jump ... and Strange was killed as a result. After the K&B interview, Strange shot a video doing some wingsuiting, which he posted to social media. Since then, he traveled the world doing extreme sports ... including base jumping into the Grand Canyon. See you on the other side.” 
 
 At 17, Strange became the youngest person to climb the world’s highest mountains in seven continents, known as the “seven summits.” 
 
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– It's been a deadly year for those who jump from extreme heights in nothing more than a wingsuit, a grim trend that continued last week with the death of Johnny Strange, an American adventurer who plunged to his death while BASE jumping in the Swiss Alps. As the Los Angeles Times reports, the 23-year-old Malibu native died seconds after leaping off Mt. Gitschen on Thursday amid reported high winds in the area. Strange's death was mourned by model Gigi Hadid, who said they attended Malibu High together. "RIP my friend, # JohnnyStrange — one of the most loving & adventurous spirits I've ever known. Bigger mountains to climb in heaven," she tweeted. Strange was acutely aware of the dangers of his sport, having BASE jumped with Dean Potter, who died during a jump at Yosemite earlier this year. "I'm sorry to hear you died flying," Strange wrote of Potter's death. "See you on the other side." Strange first achieved fame by becoming the youngest person to scale the world's seven tallest peaks at age 17. He climbed his first at 12, notes TMZ. A police investigation into his death is underway.