Catherine O'Hara's cause of death — and a private battle with cancer — has come to light weeks after the 'Schitt's Creek' and 'Home Alone' star died at 71.

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,

Actor Catherine O'Hara died of a blood clot in her lung, according to the Los Angeles Medical Examiner's Office.

Emmy-winning actress Catherine O'Hara, who starred in "Schitt's Creek" and "Home Alone," died from a blood clot in her lungs, her death certificate revealed Monday.

A little over a week after actress Catherine O’Hara passed away, her cause of death has been revealed. Advertisement