The Forsyth County Sheriff’s Office is investigating the death of a 53-year-old man whose body was found Monday afternoon behind a burning vehicle northeast of Cumming.The fire was reported about 1 p.m. and firefighters discovered the body after the flames had been put out. Sheriff’s Capt. Tim House said that authorities are working to determine how William Joseph Barefoot died, though his death is not believed to be the result of foul play. The death is under investigation and an autopsy is scheduled at the GBI Medical Examiner’s Office.“We really don’t know yet,” House said.