Catherine O'Hara died of a pulmonary embolism or blood clot in her lungs, according to media outlets that saw her death certificate Monday.

Catherine O'Hara's cause of death has been confirmed more than a week after the award-winning actress died at 71 on Jan. 30.

Catherine O'Hara died from a pulmonary embolism, according to the actress's death certificate, which was obtained by USA TODAY on Feb. 9. TMZ was first to report the news.