Up-and-coming actress Isabelle Tate - who appeared in the premiere episode of 9-1-1: Nashville earlier this month - has passed away. She was just 23 years old. Isabelle's reps at McCray Agency confirmed her death in a social media post on Wednesday, sharing: "We are deeply saddened and completely heartbroken to share that Isabelle Tate passed away on October 19th. She was 23." It's unclear what her exact cause of death was, but she was open about being diagnosed with a progressive neuromuscular disease when she was just 13.