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Death Certificate Confirms Catherine O’Hara Died of Pulmonary Embolism Linked to Rectal Cancer

The Los Angeles County record cites rectal cancer as the underlying condition with oncology treatment dating to March 2025.

Overview

  • The county death certificate, issued Feb. 9, lists a pulmonary embolism as the immediate cause of her Jan. 30 death at a Santa Monica hospital.
  • Rectal cancer is recorded as the underlying cause, with her oncologist noting treatment since March 2025 and a final visit on Jan. 27.
  • The document states she was cremated and that her remains were released to her husband, Robert “Bo” Welch.
  • Emergency crews responded to her Brentwood home around 4:48 a.m. for breathing difficulties, and she was transported in serious condition.
  • Coverage explains that cancer can raise the risk of dangerous blood clots, and specialists say her known situs inversus/dextrocardia was likely unrelated.