Catherine O'Hara suffered a medical emergency, resulting in a 911 call just hours before she was pronounced dead. The 71-year-old Schitt's Creek star was at her Los Angeles home on Friday morning when she suddenly began having difficulty breathing, dispatch audio obtained by TMZ now reveals. First responders rushed to her Brentwood home at around 5 a.m., and she was taken to the hospital. The LAFD listed her as being in serious condition. Heartbreakingly, just hours later, she was pronounced dead. A cause of death is unknown at this time.