Johnny Strange, a world record-holding adventurer, has died from a wingsuiting accident, TMZ reports. He was 23.

Sources tell the website that Strange was in Switzerland and something went wrong with his jump. On Monday, he had called into Kevin & Bean on KROQ and told the radio hosts he was shooting a wingsuit video where "we fly super close to stuff."

Strange became famous at a young age when he climbed all seven of the world's highest peaks when he was 17. He went on to travel the world doing extreme stunts, including base jumping in the Grand Canyon and skateboarding down a mountain.