Mary O’Connor, Hugh Hefner’s LONGTIME trusty secretary, who was also featured on ‘Girls Next Door,’ has died. She worked at the Playboy mansion for more than 40 years as Hefner’s personal secretary.

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Hugh tweeted the sad news on Jan. 27, ”Mary passed away today. We loved her more than words can say.”

Kendra Wilkinson tweeted, “RIP Mary O’Connor. She was an amazing person who helped me through so much. But I know she’s happy with her boo Captain Bob. :)”

Holly Madison added, “Rest In Peace Mary!”

Bridget Marquardt tweeted, “Thank you for all the sweet messages. Mary O’Connor will be missed.#RIPMary.”

Hugh is taking the death “extremely hard.” Mary was “the rock” of the mansion, and TMZ is told that everyone in the house is “incredibly sad.”

Hugh’s wife Crystal Hefner tweeted, “Hef’s long time secretary & my dear friend Mary O’Connor has passed away. It’s a very sad day here at the Playboy Mansion. We love you Mary.” source.