A medical examiner determined the deaths of 2-year-old Juliet Ramirez and 1-year-old Cavanaugh Ramirez of Weatherford were homicides.
RELATED: Texas mom charged in deaths of 2 toddlers found in hot car
Parker County records show the mother, Cynthia Randolph, was arrested in June on injury to a child counts and remains jailed. Investigators didn't immediately return a message Sunday on possible upgraded charges.
Officials say Randolph originally said her children locked themselves in her car. Temperatures were in the 90s.
RELATED: 2 toddlers found dead in hot car in North Texas
An arrest affidavit says Randolph later said her daughter refused to get out of the car so she locked both toddlers inside to teach them a lesson - thinking they'd exit on their own.
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