The 34-year-old woman had cocaine in her system and was also above the legal alcohol limit at the time of the crash
A mother was “thrown from her car” in a crash just days after Christmas, an inquest has heard. Karen Marks, 34, was pronounced dead at the scene of a crash on the A10 near Ely on December 28, 2025.
The crash involved Karen’s white Fiat Punto and a white coach. An inquest into Karen’s death was held today (Wednesday, August 5) at Vantage House in Huntingdon, and heard by Coroner Caroline Jones.
The inquest heard how Karen was travelling north on the A10 towards Ely, with the coach travelling south. A police report read out in court said that Karen “veered across the central white line” and then collided with the coach. One witness from the scene also said they saw Karen “suddenly swerve” across the carriageway.
The police statement said Karen was “thrown from her car”. Paramedics said Karen was in cardiac arrest when they arrived, with several witnesses describing how they saw CPR admitted on her.
Another passenger was in Karen’s car, and he suffered serious injuries. A witness statement read out from the passenger said that he “didn’t remember a lot from the incident” as he had a “lot of alcohol” on the day of the crash. The court then heard how the passenger had only known Karen a few hours prior to the crash.
The statement added that the passenger remembers talking to Karen before he heard a “loud bang”. The next thing he remembered he was “waking up in the hospital”. A toxicology report read out to the court said Karen had 128mg of alcohol per 100ml of blood in her system, which is above the legal limit of 80mg of alcohol per 100ml of blood.
She also had “cocaine and by-products of cocaine” in her system. The coroner said this is likely to have “contributed” to the crash, with the toxicologist stating it would have “impaired her judgement and control”.
A post-mortem confirmed that Karen suffered multiple serious injuries, but her medical cause of death was noted as “traumatic cardiac rupture and aortic transection”.
The court heard from Karen’s GP that she suffered “long-standing” mental health issues and substance abuse in the past. The GP added that Karen’s “circumstances worsened in the months leading to her death”. Coroner Jones concluded that Karen’s death was a result of a road traffic collision.
Following her death, Karen’s family described her as a “much-loved daughter, mother and sister”. In a previous tribute, they said: “Once you met Karen, you would never forget her. She was like a firework when she came in and you knew when she was around.”

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