A man was killed after a motorcycle crash at River Road and Miller Road in unincorporated Marengo Sunday morning. | Photo: Google Maps.

A 29-year-old man was found dead several hours after he crashed his motorcycle in a rural area northwest of Marengo early Sunday morning, police said.

The McHenry County Sheriff’s Office and Marengo Fire Protection District responded around 11:58 a.m. Sunday to the area of River Road and Miller Road in Marengo Township.

Deputies located a single-vehicle crash involving a 2015 Harley-Davidson motorcycle, the sheriff’s office said.

A preliminary investigation indicated that the Harley-Davidson had been traveling eastbound River Road when it failed to negotiate a curve in the road west of the intersection.

The motorcycle left the south side of the roadway, struck a fence and overturned in the 25000 block of River Road.

Authorities said the driver, a 29-year-old Belvidere man, was ejected from the motorcycle. The crash is believed to have occurred during the overnight hours from Saturday into Sunday.

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He was pronounced dead at the scene. The man was not wearing a helmet, the sheriff’s office said.

The McHenry County Conservation District Police and Marengo Police Department also assisted at the scene.

Anyone with information regarding the circumstances that led to the crash is asked to contact the McHenry County Sheriff’s Office at 815-338-2144.

The investigation is ongoing by the McHenry County Sheriff’s Major Crash Investigation Unit and the McHenry County Coroner‘s Office.