It was heard a post-mortem examination was later carried out on April 14 at Broomfield Hospital, which gave a provisional cause of death for Carol Baxter as combined fentanyl and promethazine toxicity with terminal bronchopneumonia.

Source: https://www.essexlive.news/news/essex-news/west-mersea-deaths-full-timeline-8583761

She had, as a heavy smoker, suffered bronchopneumonia but her injuries were a complicating factor in her death.

Source: https://www.examinerlive.co.uk/news/local-news/distracted-grandad-caused-death-wife-28157388