Italian orienteer Mattia Debertolis has died after collapsing during the World Games in Chengdu, China. The 29-year-old athlete was found unconscious last Friday during the men’s middle-distance event, held in temperatures above 30 degrees. Despite receiving immediate medical care at a leading Chinese hospital, he passed away four days later, according to BBC.

Debertolis, a member of the Italian national team and a civil engineer pursuing a PhD in Stockholm, was a respected competitor who finished fifth in the 2022 World Cup final. The International Orienteering Federation expressed deep sadness over the loss.

The World Games, a multi-sport event held every four years for non-Olympic sports, said it will continue to support Debertolis’ family and the orienteering community during this difficult time. The cause of his death remains unknown, BBC reported.