D.C. Boy With Autism Who Wandered Away From Home Died of Hyperthermia

Michael Kingsbury, 7, had been playing in the backyard of his family's home July 7 when he disappeared

Tuesday, Dec 3, 2013 | Updated 8:39 PM EST

The cause of the accidental death of a 7-year-old boy who wandered from his D.C. home in July was hyperthermia, according to the D.C. medical examiner.

Michael Kingsbury, who had autism, had been playing in the backyard of his family's home July 7 when he disappeared. A day-and-a-half later, his body was discovered in a car parked about 40 yards away on West Virginia Avenue NE.

Temperatures had been in the mid-80s for several days, and experts say the interior of the car likely exceeded 120 degrees.

At least six searchers -- both civilians and police officers -- had looked in, but not opened, the car while looking for the boy, said officials.

The medical examiner found no signs of trauma, and couldn't give an approximate time of death, police said, but there was obvious decomposition to the body