Grey's Anatomy and Euphoria star Eric Dane revealed he was diagnosed with amyotrophic lateral sclerosis (ALS). And, most recently, he opened up about his battle with the incurable disease in a sit-down with Diane Sawyer for Good Morning America.

Dane -- who shot to fame amid six seasons on the hit ABC drama "Grey's Anatomy," where he played Dr. Mark Sloan, affectionately known as "McSteamy" -- said his symptoms began over one year ago, when he began to experience weakness in his right hand.

Eric Dane opened up about his recent ALS diagnosis on “Good Morning America,” telling Diane Sawyer in an emotional interview that he now only has “one functioning arm.” “My left side is functioning, my right side has completely stopped working,