Catherine O'Hara Amy Sussman/Getty Images Share on Facebook Share on X Google Preferred Share to Flipboard Show additional share options Share on LinkedIn Share on Pinterest Share on Reddit Share on Tumblr Share on Whats App Send an Email Print the Article Post a Comment Catherine O'Hara's cause of death has been determined. The actress, who died Friday, Jan. 30 at the age of 71, died from a pulmonary embolism, according to The Los Angeles County Department of Public Health, as reported by TMZ. Rectal cancer was listed as the underlying cause of death.