UPDATE:  The death of a 3 year old Altoona child appears to be an accident, according to Sheriff Todd Entrekin.

The young boy was found in a vehicle, on Sunday, September 1st, outside of a residence located on Highway 278 West, Altoona.

The boy and his mother were inside the house taking a nap.

When the mother woke up she was unable to find her son inside the residence, prompting her to look outside.

The 3 year old child had left the house on his own and got into an unlocked vehicle.

The mother immediately called 9-1-1 when she found her son unresponsive.

The boy died on Friday at a Birmingham hospital. An autopsy was scheduled for Monday.

The investigation is ongoing.