Legendary actress Catherine O'Hara's cause of death has been revealed less than two weeks after her death at 71 years old. The Schitt's Creek star died of a blood clot in her lungs, according to the Los Angeles County Medical Examiner's Office, a news outlet reported on Monday, February 9. Her immediate cause of death was listed as pulmonary embolism, with rectal cancer as the underlying cause.

Catherine O'Hara's Cause of Death Revealed

Source: MEGACatherine O'Hara died of a blood clot in her lungs, according to a death certificate.

The actress has been cremated, with her remains given to her husband, Robert "Bo" Welch, per a death certificate obtained by the outlet. O'Hara's death was confirmed by her representation, Creative Artists Agency, on January 30. "Prolific multi-award-winning actress, writer and comedian Catherine O'Hara died today at her home in Los Angeles following a brief illness," the organization said in a statement to a news outlet.

Catherine O'Hara Was 'Breathing Difficulty' Before Being Rushed to the Hospital

Source: MEGACatherine O'Hara's death was confirmed on January 30.

The Los Angeles Fire Department responded to call from the star's home at around 4:48 a.m., where she was reportedly experiencing trouble "breathing difficulty" before paramedics arrived at her home and transported her to the hospital in "serious" condition. Multiple outlets reported that the actress suffered from situs inversus, a rare condition in which the arrangement of the internal organs is a mirror image of normal anatomy, according to NIH.

MORE ON:Catherine O'HaraCatherine O'Hara Was Rushed to the Hospital in 'Serious Condition' at 5 in the Morning Before She DiedCatherine O'Hara's Cause of Death: How Did the Legendary Hollywood Actress Die?Catherine O'Hara's Funeral Details Revealed: Inside the Star's Family 'Private Celebration' of LifeWant OK! each day? Sign up here!

Catherine O'Hara Made Last Public Appearance in September 2025

Source: MEGACatherine O'Hara's last public appearance was at the 2025 Emmy Awards.

O'Hara made her final public appearance alongside her husband in September 2025 while attending the Emmy Awards.

The actress was nominated for Supporting Actress in a Comedy Series for her role on the Seth Rogen-led series, The Studio and Guest Actress for a Drama Series on The Last of US.O'Hara skipped the 2026 Golden Globes in January despite being nominated.

Catherine O'Hara Revealed COVID Diagnosis Last Year

Source: MEGACatherine O'Hara revealed she contracted COVID last year.

The Beetlejuice actress experienced some health issues over the last year, revealing that she contracted COVID during the production of the The Studio."I got COVID at The Sphere, and that's all I could see watching that one. I can see my posture is just [droops her body]," she explained to a news outlet in May 2025. "I didn't test because we were trying to finish shooting, and we were leaving town in a day or two, so we had to shoot all those scenes.""I just kept my distance," O'Hara continued. "At one point, I had a water bottle down on the floor, and Evan [Goldberg] came over and he said, 'Oh, do you want your water?' 'No, don't pick it up!' I just knew, like, 'Don't touch anything!' Thank God I didn't give it to anyone."