Dave Goldberg, the successful Silicon Valley entrepreneur and husband of Facebook COO and Lean In author Sheryl Sandberg, died of heart-related causes, PEOPLE has learned.
Speculation over the exact cause of the Silicon Valley CEO’s death was rife following his death aged 47 in a hotel gym in Punta Mita, Mexico on May 1.
The SurveyMonkey CEO, who had been on vacation with his wife and family, was discovered by his brother Robert, 43, lying near a treadmill in a hotel gym and bleeding from the back of his head, according to Edgar Veytia, the attorney general for the Mexican state of Nayarit.
An initial Mexican police report said Goldberg died due to severe head trauma and significant blood loss.
However, a Silicon Valley source on Wednesday confirmed the father-of-two had died from heart complications.
On Monday, a devastated Sandberg, who spoke eloquently of carrying out Goldberg’s wishes of how to raise their son and daughter at his memorial, again took to Facebook, to respond to condolences from supporters.
She called widowhood at a young age a “club that no one wants to join.”
Friends of the couple told PEOPLE how Sandberg, 45, remembered her husband of 11 years as “the love of my life” at a May 5 memorial service that was attended by 1,700 friends, family members and colleagues.
“There she was, touched by everyone and alone at the same time,” guest Quentin Hardy, a New York Times deputy technology editor, said: “That’s how it is when you are a widow.”
Adds FORTUNE writer Adam Lashinsky, another guest at the service, “Sheryl was both the articulate public speaker we’ve come to know and the bereft widow who cried and showed us her sorrow.”
The Facebook executive and mother of two young children returned to work Monday with a modified schedule.
She has posted several wrenching messages since her husband’s death, including one last Tuesday on the day he was laid to rest.
“Even in these last few days of completely unexpected hell – the darkest and saddest moments of my life – I know how lucky I have been,” she wrote. “If the day I walked down that aisle with Dave someone had told me that this would happen that he would be taken from us all in just 11 years – I would still have walked down that aisle.
“Because 11 years of being Dave Goldberg’s wife, and 10 years of being a parent with him is perhaps more luck and more happiness than I could have ever imagined. I am grateful for every minute we had.”