PALO ALTO (CBS SF) — Autopsy results offer a different idea about how SurveyMonkey CEO David Goldberg died.

According to CBS News, Goldberg had a heart arrhythmia that may have contributed to his death.

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The 47-year-old died after a treadmill accident while on vacation with his family in Mexico.

Authorities in the Mexican state of Nayarit, where the villa is located, said an autopsy had ruled out foul play in Goldberg’s death. They noted he suffered a blunt-force injury and a cut on the head but there was no sign of struggle.

There were 24,400 injuries in the U.S. associated with treadmill accidents last year, according to the Consumer Product Safety Commission, which said there had been 30 reported deaths from 2003 to 2012.

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On Tuesday, people from Silicon Valley and beyond gathered at a Stanford auditorium for a private tribute to honor him.

U2 vocalist Bono sang before an audience of some 1,500 mourners that included Facebook CEO Mark Zuckerberg, film director George Lucas and a host of tech company founders, executives and financiers.

Afterward, mourners emerged teary-eyed from Stanford University’s Memorial Auditorium, many wearing Minnesota Vikings paraphernalia to commemorate the NFL team loved by Goldberg, a Minneapolis native.

Goldberg was the CEO of online startup Survey Monkey and the husband of Sheryl Sandberg, the Chief Operating Officer of Facebook.

“Dave was my rock,” Sandberg wrote in a Facebook post Tuesday. “We had 11 truly joyful years of the deepest love, happiest marriage and truest partnership that I could imagine.”

Sandberg also said that as heartbroken as she is, she’s grateful for every minute they had. And if someone told her that this day would come just 11 years after they married, she still would have walked down that aisle.

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