The body of a missing Ohio teenager has been discovered in a shallow grave on a farm, six days after he went missing.

Jonathan Minard, 14 from Dellroy, Ohio, disappeared after he went to a nearby New Harrisburg farm where he often worked with a 29-year-old friend, according to reports.

He spent the night with the friend on Friday, and the two went to work on the farm Saturday. That afternoon, he contacted his mother to complain about a toothache and asked if he could come home, Cleveland news station WKYC reported.

He was reported missing the next day, and his remains were found Friday in Washington Township, Ohio.

The Cuyahoga County Medical Examiner is performing an autopsy to determine how he died. Carroll County authorities have also started a criminal investigation into his death.