A police officer killed her three year-old daughter by leaving her in a sweltering patrol car for four hours so she could have sex with her boss.

Cassie Barker, 29, is set to be jailed for 20 years after admitting manslaughter Monday, and explaining what she was doing while her girl Cheyenne Hyer died in September 2016.

Cheyenne died after being left strapped into her car seat for four hours while Barker had sex with her supervisor Clark Ladner at his home in Biloxi, Mississippi.

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Barker left the car running, and air conditioning on, but it was not blowing cold air.


Cheyenne was running a temperature of 107F (41.7C) when she was admitted to hospital unresponsive that evening.

Judge Larry Bourgeois, who will sentence Barker on April 1, told her: ‘I don’t know what I could ever do to you that could be worse than what you’ve already experienced… ‘You will forever be entombed in a prison of your own mind.’

And Cheyenne’s father Ryan Hyer told the court Monday: ‘Every time I close my eyes, I picture her suffering and then I picture her laying in this coffin.

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‘I still see her smiling and laughing in my head and I would assume that smile and laughter turned to pain and suffering in that instance.’

Barker, who was working two jobs at the time of Cheyenne’s death, originally claimed she had been talking to Ladner at his home, and that she fell asleep.

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Both were fired from their jobs by the Mississippi Gulf Coast Police’s Long Beach Police Department within days of the toddler’s death.

Ladner has not been charged with any crime, because officials believed his story that he did not realize Cheyenne had been left in her mom’s car.