The sister of 17-year-old boxing up-and-comer Arturo Gatti Jr. claims he was “mysteriously killed” — and that authorities are now investigating his death as a homicide.

Sofia Gatti — the daughter of Canadian boxing legend Arturo Gatti Sr. — claims her family has “received documentation” indicating her brother’s death is being treated as a homicide by investigators after he was found hanged in a Mexico City apartment earlier this month, according to an update she shared on GoFundMe .

The grieving sister had raised more than $25,000 in donations to “hire an investigative team to get autopsy, toxicology, reports…. To find out what really happened…” 3

“I want to thank everyone who has supported the ongoing effort to uncover the truth about my brother, Arturo Gatti Jr.’s death,” Sof

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