Catherine O'Hara's brother is recalling her heartbreaking final days. Back in January, the 71-year-old actress died from a pulmonary embolism, with rectal cancer as the underlying cause. We knew she battled an illness before her death, but no one knew she had cancer at the time. Even her castmates reportedly had no idea about "any health or major issues." Now, her brother is opening up about her last moments amid the medical battle. Related: Will The Studio Acknowledge Catherine's Death In Season 2? During an episode of his Dreams of Our Loved Ones podcast, Michael P.