Eric Dane's cause of death has been revealed. Less than two weeks after news of his death shocked fans around the world, People has learned the Grey's Anatomy star died of respiratory failure. As we've been following, the Euphoria actor had been diagnosed with amyotrophic lateral sclerosis (ALS) in 2024. The debilitating progressive disease, which affects nerve cells, causes sufferers to lose muscle control, including their ability to speak, walk, breathe, and eat, according to the Mayo Clinic.