Washington Post columnist and Fox News commentator Charles Krauthammer has penned a heartfelt letter announcing that he has just weeks to live.His Friday announcement came via Krauthammer’s editorial home at The Washington Post.In his letter, Krauthammer discussed his battle with cancer that began 10 months ago with a tumor in his abdomen. His doctors thought he was on the road to recovery. Recently, the tumor returned in an aggressive form."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 writes.