4:33 PM PT-- Rupert Murdoch, the Executive Chairman of FOX News and 21st Century FOX, said in a statement ... “Charles has been a profound source of personal and intellectual inspiration for all of us at Fox News. His always principled stand on the most important issues of our time has been a guiding star in an often turbulent world, a world that has too many superficial thinkers vulnerable to the ebb and flow of fashion, and a world that, unfortunately, has only one Charles Krauthammer. His words, his ideas, his dignity and his integrity will resonate within our society and within me for many, many years to come.”

Longtime FOX News analyst Charles Krauthammer says he's been diagnosed with terminal cancer and only has a few weeks to live ... but wants everyone to know, "It was a wonderful life."

The 68-year-old political commentator says he's been "uncharacteristically silent these past ten months" after surgery to remove a cancerous tumor in his abdomen.

Doctors initially thought the surgery was successful, but recent tests show the cancer is aggressive and spreading rapidly and he only has weeks to live.

"My doctors tell me their best estimate is that I have only a few weeks left to live. This is the final verdict. My fight is over," Krauthammer wrote in an open letter.

Krauthammer -- who is paralyzed from a diving incident decades ago -- thanked his employers, his colleagues, readers and viewers and

"I leave this life with no regrets. It was a wonderful life full and complete with the great loves and great endeavors that make it worth living."