Katherine Heigl is mourning the loss of her old pal Eric Dane. In a new Instagram post on Sunday, the actress shared a super rare post, highlighting her feelings on her Grey's Anatomy costar's death. She shared a photo of herself and Eric, writing in the caption that this is way out of her comfort zone: "I debated this post for days. I have never been comfortable grieving publicly. I share my tears, my stories and my memories with those I'm closest to and more times than not I share them only with the heavens alone.