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WEATHORFORD, Texas – A North Texas mother has been indicted on two counts of knowingly causing serious bodily injury to a child after her two toddlers died in a hot car.

A Parker County Grand Jury indicted 25-year-old Cynthia Marie Randolph on Thursday. The first degree felony charges carry a sentence of up to life in prison. It was unclear from court records if Randolph has an attorney.

Cynthia Randolph

Records show Randolph was arrested in June for the May 26 death of 1-year-old Cavanaugh Ramirez and 2-year-old Juliet Ramirez.

An arrest warrant says Randolph told police she locked the two children in the car to teach them a lesson after finding them playing inside the vehicle.

Randolph said she thought her daughter would open the door when they wanted to leave.

She admitted to police that she went back into the house, smoked marijuana and then fell asleep for several hours.

The temperature outside had reached 96 degrees.

Autopsy reports released earlier this month ruled the deaths homicides.