Cause of Death Confirmed for Canadian-American Actress Catherine O'Hara
Washington D.C. The cause of death for Canadian-American actress Catherine O'Hara has been confirmed as pulmonary embolism, where blood clots form in the lungs. This was listed as the immediate cause on her death certificate. The underlying cause of death was stated as rectal cancer. O'Hara passed away at the age of 71 in a Los Angeles hospital on January 30.
According to documents, she had been undergoing treatment for cancer since March 2025. O'Hara is survived by her husband, Bo Welch, two sons, Matthew and Luke, and six siblings. Pulmonary embolism is a life-threatening condition where blood clots begin to form in the pulmonary arteries of the lungs. Symptoms can include difficulty breathing, chest pain, and sometimes coughing up blood.
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