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"Tristan was part of Square's founding story and we are deeply saddened by his passing," a Square spokesperson told CNBC. "Our thoughts are with his family and friends."
O'Tierney left Square in 2013.
His mother, Pamela, blamed the death on a fight with addiction, for which he had been seeking help at a recovery center.
"I know he got to the hospital, he couldn't breathe and they couldn't revive him," Pamela O'Tierney told the San Francisco Chronicle. It's unclear what exactly caused his death.
According to his LinkedIn profile, O'Tierney held positions at Yahoo!, Brand Logic and Apple before starting at Square in 2009.
He spent nearly four and a half years at Square, where he worked on the company's first iPhone and iPad apps. Most recently, he was a freelance photographer in Los Angeles.