Updated Feb. 9, 2026, 3:20 p.m. ET Catherine O'Hara's cause of death has been confirmed after the award-winning actress died at 71 the morning of Jan. 30. The "Home Alone" actress died from a pulmonary embolism, according to O'Hara's death certificate, which was obtained by TMZ on Feb. 9. Per the document, she'd died at a Santa Monica, California, hospital within hours of the onset of symptoms.