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A POLICE officer who left her three-year-old daughter to roast to death in her 40C patrol car while she had sex with her boss has been jailed for 20 years.

Cassie Barker, 29, strapped little Cheyenne Hyer into a seat for four hours while she romped with her supervisor Clark Ladner.

 Ex-cop Cassie Barker, 29, admitted the manslaughter of her daughter Cheyenne Hyer
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Ex-cop Cassie Barker, 29, admitted the manslaughter of her daughter Cheyenne HyerCredit: WLOX

A court heard she left the engine running outside his home with the air conditioner on, but it was not blowing cold air.

After the tryst she found Cheyenne unconscious and rushed her to hospital with a severe high temperature of 41.7C.

She died later that evening in September 2016.

The negligent mum - who is pregnant again -  admitted manslaughter last month in a plea deal after she was initially charged with second degree murder.

Yesterday she was given the maximum 20-year sentence by a judge in Mississippi, US.

Cheyenne's father Ryan Hyer had begged the court for the stiffest possible penalty, saying he was haunted  by the tragedy, .

He told the judge: "Every time I see a patrol car, I see Cheyenne gasping for air.

“I’ve blamed myself for everything. Life has been a complete hell. There’s no sentence big enough that will ever bring her back to us.”

The court heard it was not the first time Barker had left the tot alone in a car.

A passerby had called police when they saw Cheyenne in a vehicle parked outside a strip mall in Gulfport.

During her plea hearing, she admitted she was having sex with her police supervisor while Cheyenne was dying of heatstroke.

Ladner, her boss, was sacked from the force but faced no charges. He told investigators he did not know his lover had left her child in the car.

Mr Hyer is suing the police, claiming they should have done more after the first instance of child neglect.

 Cheyenne Hyer, 3, died in September 2016 after being left for four hours in a hot patrol car
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Cheyenne Hyer, 3, died in September 2016 after being left for four hours in a hot patrol carCredit: WLOX
 Cassie Barker was romping with her supervisor while her child died from heat stroke
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Cassie Barker was romping with her supervisor while her child died from heat strokeCredit: Wlox
 Cassie Barker was sacked from the force and charged with second degree murder but accepted a plea deal for manslaughter
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Cassie Barker was sacked from the force and charged with second degree murder but accepted a plea deal for manslaughterCredit: WLOX
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Credit: WLOX
Police officer mum Cassie Barker pleads guilty to sleeping with boss while her toddler was left to die in hot car


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