Fire crews were dispatched at 7:29 a.m. after someone spotted the wreckage of a single-engine plane in an area off of Meyer Road just north of Pleasant Grove Road, according to Marengo firefighter Joe Taylor.

The home-built Zenair CH601 small aircraft crashed in a field under “unknown circumstances” and the pilot was killed, according to FAA spokesman Tony Molinaro. The pilot was the only occupant.

McHenry County Coroner Anne L. Majewski confirmed that a man was pronounced dead at the scene of the crash, but he has not yet been identified as of Saturday afternoon. An autopsy is scheduled for Monday morning.

The crash appeared to have occurred sometime between Friday night and early Saturday morning, Taylor said.

The FAA and NTSB will be investigating the crash. Further details were not immediately available.