Maria O'Brien, an acting coach and actor, has passed away at the age of 75. Known for her roles in films such as "Smile" and "Protocol," she also made numerous TV appearances throughout the 1980s and 1990s. She was an advocate for Alzheimer's Disease research and won a Drama-Logue award for "The Maids" by Jean Genet in 1990. O'Neill also held a 15-year position as the acting coach on the drama series "Days of Our Lives" until 2022.