He was 47.
From the Times:
Mr. Goldberg, 47, who was on vacation with family and friends, collapsed [in a gym] while exercising, said the person, who spoke on condition of anonymity because the family wished to keep the details private. “Efforts to revive him at the gym and at a hospital were unsuccessful,” the person said.
His death was first announced by his brother Robert.
"No words can express the depth of loss we feel, but we want his children to learn how much he meant to all of you. In lieu of donations, we want to celebrate his life in a manner that respects the family’s privacy as they cope with this tragic, life changing event: Sheryl, their children, and our family would be grateful if people would post their memories and pictures of Dave to his Facebook profile," he said.
Facebook CEO Mark Zuckerberg called Goldberg an "amazing person."
"Dave Goldberg was an amazing person and I am glad I got to know him. My thoughts and prayers are with Sheryl and her family. I hope friends will join me in celebrating his life by sharing your memories of Dave on his proflle, as his brother Rob suggests," he said.
Sandberg has yet to make a public statement.