Brynn Hawkins, one, and Addyson Overgard-Eddy, two, died in hospital at about 5pm on Thursday (June 8).
The sheriff didn't say exactly what Hawkins and her friends were doing in the house. The toddlers were transferred to University Hospital in San Antonio in "grave condition", Hierholzer said.
On Wednesday, Hawkins and a male friend, 16, rushed her two daughters to the Peterson Regional Medical Center, where she told attending physicians that the girls had suddenly collapsed while on an outing at Flat Rock Park. Hawkins allegedly bathed the children in an attempt to avoid a hospital visit, police said.
The sisters' final day of consciousness had not been spent among flowers, he said, but rather intentionally trapped inside an SUV that grew hotter by the hour in "the most horrific case of child endangerment that I have seen in the 37 years that I have been in law enforcement".
According to a news release by Kerr County Sheriff W.R. Hierholzer, their investigators had discovered that Hawkins had left the two #toddlers in the vehicle on Tuesday night, leaving them there until noon the next day.
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Police say she did seek medical attention at first, fearing she would be in trouble, but she was convinced to take them into hospital. Hawkins has been charged with two counts of abandoning or endangering a child.
Police will decide whether to upgrade charges following findings being presented to a grand jury which may choose to indict the mother on murder charges.
People inside the house reported hearing the children crying but nobody went to check, he said to KABB.
Officers surrounded a large area around the crime scene while they looked for the attacker on the ground and via helicopter, police said.
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Her 16-year-old male friend may also face charges. The Kerr County children were the fourth and fifth children to die after being left in a hot vehicle in Texas this year and the 10th and the 11th in the United States.
'I hesitated for so long because I didn't want her kids in the system, ' told Davis.
"She said: 'No, it's fine".
In that case, Parker County Sheriff's Capt. Mark Arnett told CNN that according to the mother, the children were playing in a back room of their home when they disappeared. Get email alerts from KSAT 12 today.
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