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Dave Goldberg, the husband of Facebook's Sheryl Sandberg and CEO of SurveyMonkey, died after collapsing and falling off a treadmill at a gym in Mexico. Goldberg was on vacation with his family at the Four Seasons Resort near Puerto Vallarta. On Friday afternoon he went to exercise and was found by his brother a few hours later on the floor. According to a regional prosecutor's spokesman, "he fell off the treadmill and cracked his head open." He died of head trauma and blood loss. The family will hold a celebration of Goldberg's life on Tuesday at Stanford.