Fleming County Deputy Coroner Gary Workman says the boy and his two-year-old sister were found in the van by their mother at their home this morning.
The van doors were locked and the mother had to break a window to get the children out. Workman says he suspects the death was heat-related, but an official cause of death will not be determined until an autopsy is conducted.
The little girl was taken to a local hospital where she was alert and "appeared to be in good shape."
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