Police investigate a fatal single-vehicle crash involving an SUV that struck a tree on Kimball Avenue east of Jefferson Street in Woodstock Sunday evening. | Photo: WFRD

The police chief says investigators are still working to determine what caused a man to crash his SUV into a tree, leaving him dead, in a neighborhood in Woodstock.

The Woodstock Fire/Rescue District and Woodstock Police Department responded around 9:56 p.m. Sunday to the 400 block of East Kimball Avenue in Woodstock for a vehicle crash.

Woodstock Fire/Rescue District Public Information Officer Alex Vucha said 911 dispatchers reported the vehicle had struck a tree and CPR was in progress on the driver.

Firefighters and paramedics arrived within four minutes to find a heavily damaged SUV that had collided with a tree.

Firefighters respond to a fatal single-vehicle crash involving an SUV that struck a tree on Kimball Avenue east of Jefferson Street in Woodstock Sunday evening. | Photo: WFRD

Police officers were performing CPR on the driver, who was immediately transferred to an ambulance, Vucha said.

McHenry County Coroner Dr. Michael Rein identified the driver as Greggory Rokus, 53, of Woodstock.

Rokus was pronounced dead by paramedics at the scene due to the severity of his injuries.

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Vucha said the man was the sole occupant of the vehicle and no other traveling vehicles were involved.

Firefighters remained on the scene until 12:30 a.m. Monday assisting law enforcement with the investigation and coordinating with the McHenry County Coroner’s Office.

Police investigate a fatal single-vehicle crash involving an SUV that struck a tree on Kimball Avenue east of Jefferson Street in Woodstock Sunday evening. | Photo: WFRD

Kimball Ave was shut down in both directions for the duration of the incident.

The McHenry County Regional Major Crash Assistance Team (MCAT) was called to the scene to conduct the crash investigation.

Woodstock Police Chief John Lieb said Tuesday that the SUV was traveling westbound on Kimball Avenue when it struck the tree.

Debris from the impact struck a parked car in a driveway.

Police and the fire department respond to a fatal single-vehicle crash involving an SUV that struck a tree on Kimball Avenue east of Jefferson Street in Woodstock Sunday evening. | Photo: WFRD

Lieb said the homeowner was the one who called 911 to report the incident.

Rokus was still inside the car when officers arrived but the impact knocked him out of the driver’s seat.

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Lieb said it is unknown yet what led to the crash.

He said investigators are doing the best they can to get answers for Rokus’ family.