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The 29-year-old was found unconscious by organisers during an orienteering event last Friday in Chengdu.
The Italian died on Tuesday - four days after his collapse.
He was taking part in the final of the men's middle-distance event, which took place in temperatures above 30 degrees, when he collapsed.
"Despite receiving immediate expert medical care at one of China's leading medical institutions, he passed away," World Games organisers said in a statement.
Debertolis' cause of death is unknown at this stage.
The Italian was one of 12 athletes listed as "Did Not Finish" in the official results.
He was part of the Italian national team and finished fifth in the 2022 World Cup final.
Debertolis, who was qualified as a civil engineer, resided in Sweden and was studying for a PhD at a university in Stockholm.
World Games organisers said they will "continue to support the family of Debertolis and the orienteering community in every possible way."
Mattia Debertolis: Italian athlete dies after collapse at World Games
Italian athlete Mattia Debertolis dies after collapsing during orienteering event in China.
www.bbc.com
