Catherine O'Hara and her family did not tell anyone about her illness! Not even her closest friends, according to a new source! As we reported, the 71-year-old actress died on Friday "following a brief illness." The Los Angeles Fire Department responded to a call to Catherine's home at 4:48 a.m. about an "approximately 70-year-old" who was having difficulty breathing. They subsequently took her to a hospital "in serious condition," where she passed away. Related: How Catherine's Family Plans To Honor Her Following Her Death An exact cause of death is unknown.