The Grey’s Anatomy star’s death certificate, which has been seen by People, confirms that he died from respiratory failure, with amyotrophic lateral sclerosis (ALS) listed as an underlying cause.
Dane — who was 53 when he passed away on February 19 — publicly revealed his ALS diagnosis in April 2025, nearly a year before his death.
Dane’s family were the first to announce his passing, revealing that he was surrounded by loved ones in the days before he died.