Hugh Hefner's Longtime Secretary Mary O'Connor Passed Away: The Girls Next Door Share Their Grief On Twitter

What an incredibly sad day. Anyone who is familiar with Hugh Hefner, Playboy, or even just The Girls Next Door, also knew about his very close friendship with his longtime secretary Mary O'Connor, who was frequently featured on the reality series and largely considered to be a part of his, ahem, 'unconventional' yet very loving