Just months after revealing his ALS diagnosis publicly, actor Eric Dane speaks out for the first time in a interview with Diane Sawyer about the moment he first noticed the warning signs, and more.

ALS has robbed Eric Dane of functioning in his right arm and is creeping through his left, the veteran actor said in an emotional interview about the diagnosis he revealed in April.

During a sit-down interview with Diane Sawyer on "Good Morning America," Eric Dane opened up about his harrowing ALS diagnosis and navigating the heartbreaking effects.