The world of entertainment was left reeling on January 30, 2026, with the unexpected passing of Catherine O’Hara, the beloved Canadian-born comic actress whose career spanned more than five decades. The cause of her death, as revealed by a Los Angeles County death certificate released on February 9, was a pulmonary embolism—a blood clot that blocks an artery in the lungs—while rectal cancer was listed as the underlying cause (according to TMZ, Rolling Stone, and The Associated Press).
O’Hara, 71, died at a hospital in Santa Monica, California, after what her representatives initially described as a “brief illness,” leaving fans and colleagues stunned by the suddenness of her departure. The death certificate, obtained by Rolling Stone and TMZ, confirmed that she had been under the care of an oncologist since March 2025 and was last seen by her doctor just three days before her death. After her passing, she was cremated, with her ashes entrusted to her husband, production designer Robert “Bo” Welch. The couple’s cottage in Muskoka Lakes, Ontario, was listed as the final resting place for her remains.
For many, Catherine O’Hara was more than just an actress; she was a comedic force whose work shaped the landscape of television and film comedy. O’Hara first rose to fame as part of the legendary Toronto-based comedy troupe Second City, and her breakout came on SCTV, where her sharp wit and chameleonic performances made her a standout. She went on to star in an array of memorable films, including the holiday classic Home Alone series—where she played the unforgettable mother of Macaulay Culkin’s character—Tim Burton’s Beetlejuice, and a string of Christopher Guest’s celebrated mockumentaries such as Best in Show and A Mighty Wind.
Her later career was defined by her role as the dramatic, eccentric matriarch Moira Rose in the Emmy-winning series Schitt’s Creek. The performance earned her an Emmy, two SAG Awards, and a Golden Globe, cementing her place in television history. Just last year, she received additional Emmy nominations for her work on The Studio and The Last of Us, proving her enduring appeal and versatility (Rolling Stone, TMZ).
O’Hara’s death certificate not only clarified the medical circumstances of her passing but also shed light on a private health battle. While her agency, Creative Artists Agency, initially cited a “brief illness” as the cause of death, the document confirmed that rectal cancer had been a long-term challenge for the actress. The diagnosis was kept private, with only close family and her medical team aware of the details. Her struggle with cancer was not widely known, making the news all the more shocking for her fans and many in the industry (The Associated Press, TMZ).
Medical experts note that a pulmonary embolism, the immediate cause of O’Hara’s death, is a sudden blockage in a lung artery, often caused by a blood clot that travels from the legs or pelvis. According to the Cleveland Clinic, about a third of people with a pulmonary embolism die before diagnosis and treatment, highlighting the condition’s severity and the importance of rapid intervention. Cancer, including rectal cancer, can increase the risk of developing blood clots, making such complications tragically common among cancer patients (Nexstar, Rolling Stone).
Rectal cancer itself is a formidable disease. As explained by the Mayo Clinic and the American Cancer Society, it begins with abnormal growths called polyps in the rectum and often requires aggressive treatment, including surgery, radiation, and chemotherapy. Colorectal cancer, which includes both colon and rectal cancers, is among the leading causes of cancer-related deaths in the United States. This year alone, nearly 50,000 new cases of rectal cancer are expected to be diagnosed, with colorectal cancer accounting for roughly 55,000 deaths nationwide (Nexstar).
In addition to her cancer diagnosis, O’Hara had previously revealed she was born with a rare genetic condition called situs inversus, in which the organs are mirrored from their usual positions. Her heart, for instance, pointed to the right side of her chest, a condition known as dextrocardia. While usually harmless, situs inversus can sometimes be associated with other complications. O’Hara discovered her unique anatomy as an adult during routine medical testing, and she spoke about it with characteristic humor and candor in interviews (Nexstar, NBC Los Angeles).
Following the announcement of her death, tributes poured in from across the entertainment world. Macaulay Culkin, who played her son in Home Alone, shared a heartfelt message on Instagram: “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, her co-star in Beetlejuice, wrote, “She’s been my pretend wife, my pretend nemesis and my real life, true friend. This one hurts. Man am I gonna miss her.” Seth Rogen, who worked with O’Hara on The Studio, described her as “hysterical, kind, intuitive, generous... she made me want to make our show good enough to be worthy of her presence in it.”
Her longtime collaborator Eugene Levy, with whom she shared the screen in SCTV and Schitt’s Creek, expressed his deep admiration and affection, while his son Dan Levy, co-creator and co-star of Schitt’s Creek, said, “It’s hard to imagine a world without her in it. I will cherish every funny memory I was fortunate enough to make with her.” Annie Murphy, Justin Theroux, Christopher Guest, Tim Burton, Martin Scorsese, Martin Short, and Steve Martin were among the many who also paid tribute, underscoring O’Hara’s profound impact on peers and audiences alike (Rolling Stone, TMZ, The Associated Press).
O’Hara is survived by her husband Bo Welch, sons Matthew and Luke, and siblings Michael, Mary Margaret, Maureen, Marcus, Tom, and Patricia. Her legacy, however, extends far beyond family. From her early days in Toronto to the heights of Hollywood and the hearts of millions, Catherine O’Hara leaves behind a body of work that continues to inspire and delight. Her humor, generosity, and originality will be remembered by those who knew her and those who loved her from afar.
In the end, Catherine O’Hara’s life was a testament to the power of laughter and resilience, her career a masterclass in comic timing and heartfelt performance. The entertainment world feels a little less bright without her, but her spirit endures in every unforgettable character she brought to life.