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Catherine O'Hara died from a pulmonary embolism. Cancer was the underlying cause

LOS ANGELES — Catherine O’Hara died from a pulmonary embolism, with cancer as the underlying cause.

A Los Angeles County death certificate issued Monday lists the pulmonary embolism, which occurs when a blood clot blocks an artery in the lungs, as the immediate cause of the actor's Jan. 30 death at age 71. Rectal cancer was the long-term cause.

The oncologist who signed off on the certificate indicated that he had been treating O'Hara since March of last year, and last saw her on Jan. 27. She died at a hospital in Santa Monica, California.

The beloved Canadian-born comic actor and “SCTV” alum starred as Macaulay Culkin's mother in two “Home Alone” movies and won an Emmy as the dramatically oblivious matriarch Moira Rose in “Schitt’s Creek.”

Her death was a surprise to most, and an initial statement from her representatives said only that she died “following a brief illness.”

Collaborators including Culkin, Christopher Guest, Eugene Levy and Pedro Pascal paid her loving tribute after her death.

The document said she was cremated. It lists her profession as “actress” and her business as movies. It said she practiced her trade for 50 years.

FILE — Catherine O'Hara, a cast member in the Apple+ series “The Studio,” poses for a portrait on Thursday, March 20, 2025, in Los Angeles. (AP Photo/Chris Pizzello, File) (AP Photo/Chris Pizzello, File)
FILE — Eugene Levy, from left, Annie Murphy, Daniel Levy and Catherine O'Hara cast members in the series “Schitt's Creek” pose for a portrait during the 2018 Television Critics Association Winter Press Tour in Pasadena, Calif., on Jan. 14, 2018. (Photo by Willy Sanjuan/Invision/AP, File) (Photo by Willy Sanjuan/Invision/AP, File)
FILE — Catherine O'Hara arrives at the 77th Primetime Emmy Awards in Los Angeles on Sept. 14, 2025. (Photo by Richard Shotwell/Invision/AP, File) (Photo by Richard Shotwell/Invision/AP, File)