In January, 29-year-old Valdet Gashi told his wife and two daughters that he was travelling first to Switzerland, and then to Thailand. A kind of prolonged business trip relating to his title as a two-time Thai Boxing Champion. He updated his family through social media. A Facebook post from May shows an older photo of him in Bangkok. The caption describes his excitement about returning to the city in a few days, RIA Novosti reported.

Gashi never returned to Thailand, nor did he intend to. Instead, he and three other Thai boxers traveled to crisis-torn Syria to join the ISIS terrorist group.

"Don’t judge…before you know the whole story," he wrote in another post once news of his true whereabouts became public. "Before you begin to judge me because of what I do, wait till you know the whole story."

The "whole story" is difficult to pin down. According to a telephone interview Gashi conducted with Swiss radio channel Schweizer Radio und Fernsehen, the four boxers fought with the terrorist group in Syria. The Albanian-born Gashi was then reportedly in charge of a Turkish border crossing along the Euphrates River, cutting off cigarette smugglers trying to enter ISIS territory.

"If I die while doing good, I of course will be glad," Gashi told Swiss TV channel SRF last month.

Throughout this time, he was also said to be in contact with terror expert Samuel Althof, according to SRF. Earlier this month, that communication line suddenly went dark.

According to the family, Gashi had been killed, though the exact cause of his death was unknown. But on Monday, the so-called Syrian Observatory for Human Rights said that the boxer had been executed by the ISIS Takfiri terrorist group after trying to flee Aleppo with "another group".

According to the International Business Times, the observatory’s claims are based on "reliable sources".

Those sources said that after initially defending ISIS’s barbaric practices, Gashi had become "shocked" by the violence he witnessed. He was captured in his effort to escape, held in captivity in the city of Manbeg, and later killed by the terrorist group.

Prior to the news of his death, Gashi’s family had encouraged him to return home. According to German newspaper Rundschau, the boxer’s father, Enwar Gashi, said his son should stop this "nonsense" in Syria and help Muslims in Germany.

Of course, reports coming out of territory controlled by ISIS are hard to verify. While both Gashi’s family and the observatory’s sources have stated that Gashi has died, the observatory has also heard conflicting accounts that he is alive and still trying to escape.