Catherine O'Hara Cause of Death: Pulmonary Embolism Due to Rectal Cancer
The entertainment world is still mourning the loss of Catherine O'Hara, and now the full medical picture has been confirmed. The beloved actress and comedian died on January 30, 2026, at age 71 — and her official cause of death has been on the public record since February 9. Here is a complete breakdown of what happened.
Catherine O'Hara Cause of Death: Official Death Certificate
A Los Angeles County death certificate lists pulmonary embolism — which occurs when a blood clot blocks an artery in the lungs — as the immediate cause of Catherine O'Hara's January 30 death at age 71. Rectal cancer was the long-term underlying cause.
First responders were dispatched to O'Hara's Brentwood home at approximately 5:00 a.m. on January 30. She was transported to a local hospital in serious condition, where she died several hours later. Her representatives initially described it only as death "following a brief illness."
The death certificate also confirmed O'Hara was cremated and her remains were given to her husband, Robert "Bo" Welch.
What Is a Pulmonary Embolism?
A pulmonary embolism is a sudden blockage in a lung artery. It usually happens when a blood clot deep in the leg or pelvis breaks loose and travels to the lungs, restricting blood flow, lowering oxygen levels, and increasing blood pressure. About 33% of people with pulmonary embolisms die before they are able to get treatment, making it the third most common blood vessel condition after heart attack and stroke.
The most common symptoms include sudden shortness of breath, chest pain that worsens with deep breathing, and an unexplained rapid heart rate. Some people also cough up blood and experience lightheadedness or fainting. What makes pulmonary embolism especially alarming is that it can strike people who seem otherwise well, and symptoms can be mistaken for other problems.
How Rectal Cancer Contributed
The oncologist who signed off on the certificate indicated he had been treating O'Hara since March of last year and last saw her on January 27 — just three days before her death.
Having cancer, as O'Hara did, can significantly increase the risk of developing a pulmonary embolism. Between 3% and 10% of cancer deaths are due to pulmonary embolism, according to MD Anderson Cancer Center estimates.
A Career That Spanned More Than 50 Years
O'Hara's career spanned more than 50 years, beginning on the Canadian sketch show SCTV, for which she won the first Emmy of her career for writing. She went on to star as Delia Deetz in Tim Burton's "Beetlejuice" in 1988 and reprised the role in the 2024 sequel. O'Hara rose to global fame playing Kate McCallister — the mother who leaves her son Kevin behind — in the 1990 hit "Home Alone" and its sequel.
For the final two seasons of "Schitt's Creek," she received an Emmy Award, a Golden Globe, a SAG Award, a Critics' Choice Award, and multiple Canadian Screen Awards for her role as Moira Rose. She had also recently appeared in "The Last of Us" and "The Studio," earning two additional Emmy nominations in 2025.
Tributes From Hollywood
Macaulay Culkin posted on Instagram alongside images of the two of them from "Home Alone" and together at his Hollywood Walk of Fame ceremony — "Mama. I thought we had time. I wanted more. I wanted to sit in a chair next to you. I heard you. But I had so much more to say. I love you. I'll see you later."
Michael Keaton, who starred alongside O'Hara in "Beetlejuice" and "The Paper," wrote on Instagram that she had been his pretend wife, his pretend nemesis, and his real-life true friend — adding simply, "This one hurts. Man am I gonna miss her."
Catherine O'Hara was 71 years old. She is survived by her husband Robert "Bo" Welch and her two sons.
