Article continues below advertisementShocking new details surrounding Catherine O'Hara's sudden death have been revealed.According to 911 dispatch audio obtained by an outlet, the late actress was experiencing "breathing difficulty" before paramedics arrived at her home at 4:48 a.m. on Friday, January 30.O'Hara was rushed to the hospital in "serious" condition. Shortly after, the star passed away at age 71.Article continues below advertisementSource: MEGACatherine O'Hara's cause of death has not yet been revealed.