SurveyMonkey CEO David Goldberg died of severe head trauma in an exercise accident a Mexican state official said.
Goldberg was found lying next to a treadmill on Friday at a resort near Puerto Vallarta.
The official said he left his room at about 4pm to exercise, and family members went to look for him after he didn't return. He was found at about 6.30pm lying by a treadmill in a pool of blood, with a blow to the lower back of his head. He apparently had slipped on the treadmill and hit the machine. Goldberg, who was married to Sheryl Sandberg, the chief operating officer of Facebook, last year spoke at the Web Summit in Dublin.