A 7-month-old boy left overnight inside the family car in North Texas was found dead on Wednesday morning, Cedar Hill police said.

The child was left in his car seat after his mother picked up her three children from day care, MyFOXDFW.com reported.

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 degrees.

Wilson's two other sons are now in the care of Child Protective Services.

Click here for more on this story from MyFOXDFW.com.

The Associated Press contributed to this report.