It was not immediately clear how the boy got into the car.
City police officers were called shortly after 5 p.m. to a home in the 300 block of North 11th Street. Family members told officers they were looking for the child, who had last been seen about 2 1/2 hours earlier.
They found the child in a family car, unconscious and not breathing, police spokesman Ed Cunningham said.
Detectives are still investigating and the cause of death is yet to be determined, he said.
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