Mary O'Connor, Hugh Hefner's secretary at Playboy for more than 40 years, has died.
"Mary passed away today. We loved her more than words can say," Hef tweeted.
Girls Next Door stars Holly Madison, Kendra Wilkinson-Baskett and Bridget Marquardt all took to Twitter to offer condolences, as did Hef's new wife, Crystal Harris.
Holly wrote, "Rest In Peace Mary."