O'Hara, best known for her roles in the holiday classic and show Schitt's Creek, passed away suddenly on January 30.

The Schitt's Creek and Home Alone actress died last month in a US hospital, at the age of 71.

The cause behind the "Home Alone' and 'Schitt's Creek" actor's death at age 71 has been revealed after she was discovered unresponsive in her LA home.

The Canadian-American actress died at her home in Los Angeles in January.

The actress died on 30 January in a Santa Monica hospital, at the age of 71.

Catherine O'Hara's cause of death was revealed on Feb. 9, 10 days after the "Home Alone" star died. The actress suffered from a pulmonary embolism and was also battling cancer.

Catherine O'Hara died from a pulmonary embolism, while her death certificate also lists cancer as an underlying factor.

A death certificate released on Monday also said rectal cancer was an underlying cause for the comedic actress’s death on Jan. 30 at 71.

Catherine O'Hara died from a pulmonary embolism, while her death certificate also lists cancer as an underlying factor.

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

The Emmy-winning actress was rushed to hospital on 30 January, where she was pronounced dead.