Catherine O'Hara's cause of death was a pulmonary embolism, with cancer as underlying cause, AP reports

Catherine O'Hara died from a pulmonary embolism, with cancer as the underlying cause, according to a Los Angeles County death certificate issued Monday, The Associated Press reported. In:

Catherine O'Hara died from a pulmonary embolism, with cancer as the underlying cause, according to a Los Angeles County death certificate issued Monday, The Associated Press reported.

The certificate 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. She was cremated, according to the document.

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 wealthy matriarch Moira Rose in "Schitt's Creek."

Her death came as a surprise to most fans, and an initial statement from her representatives said only that she died "following a brief illness."