Dave Goldberg, the 45-year-old CEO of Survey Monkey and husband of Lean In author, Sheryl Sandberg, died Friday night of unknown causes, according to BuzzFeed. Dave's brother Robert shared the news on Facebook, where it was then shared by Facebook CEO Mark Zuckerberg. Read his statement in full below. Our thoughts go out to Dave's family and friends during this difficult time. "It’s with incredible shock and sadness that I’m letting our friends and family know that my amazing brother, Dave Goldberg, beloved husband of Sheryl Sandberg, father of two wonderful children, and son of Paula Goldberg, passed away suddenly last night. In this time of sorrow, we mourn his passing and remember what an amazing husband, father, brother, son and friend he was. 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."