Laheather Wilson, 35, told police she went outside before 6 a.m. Wednesday and found her son unresponsive. Wilson was charged with injury to a child and was being held at the Dallas County Jail Wednesday night. It was not immediately known whether she had an attorney.
The Dallas County Medical Examiner has not released a cause of death.
The overnight low recorded at Dallas-Fort Worth International Airport was 50.
Wilson's two other sons are now in the care of Child Protective Services.
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