Watch | Sheryl Sandberg talks about husband’s death in powerful speech

Facebook Chief Operating Officer Sheryl Sandberg encouraged graduating seniors at the University of California, Berkeley to persevere in life's challenging times, speaking publicly for the first time about her husband's death during a commencement speech.

Sandberg, whose husband, Dave Goldberg, died in a treadmill accident while on vacation last year in Mexico, said she was “swallowed up in the deep fog of grief.”

Losing her husband helped her find deeper gratitude for the kindness of her friends, the love of her family and the laughter of her children, Sandberg told the crowd.