A 19-year-old Deer Park man is facing a felony reckless homicide charge after what police say was a high-speed crash on Lake Cook Road in Arlington Heights that killed a 69-year-old Des Plaines man in January 2025. The charge follows an 18-month investigation into the collision. The driver remains jailed and is set to appear in court again on August 14, 2026.
Police say charges follow 18-month probe
Arlington Heights police announced the felony case after an 18-month investigation that included downloading vehicle data, analyzing video, interviewing witnesses and conducting forensic reviews, according to the Daily Herald. Investigators said they built a comprehensive crash reconstruction to support criminal prosecution and that the work required "countless hours," according to the department’s release.
Crash scene and reconstruction
The collision happened around 4:30 p.m. on Jan. 25, 2025, when a dark-gray 2020 BMW M340i traveling east on Lake Cook Road struck the driver’s side of a 2002 Jeep Grand Cherokee that was turning from Bloomington Avenue, causing the Jeep to roll multiple times, according to Lake and McHenry County Scanner. Investigators said the Jeep’s driver side suffered significant intrusion. A completed crash reconstruction found the BMW was traveling at a speed nearing twice the posted 45 mph limit immediately before impact. Driver Critically Injured was among the early coverage of the collision in January 2025.
Victim and aftermath
The Jeep’s sole occupant, Rafael G. Mercado, 69, of Des Plaines, was pulled from the wreck and taken to Advocate Lutheran General Hospital, where he died early on Jan. 26, 2025, authorities said. Three teenage occupants of the BMW were evaluated by paramedics; two declined ambulance transport and were later picked up by family, while a third was transported to a local hospital with injuries described as not life-threatening, according to the Daily Herald.
Court timeline
The driver, identified as Dobrolinski, appeared at the Third District Cook County Courthouse this week for a detention hearing, where a judge granted a petition to detain him pending trial, according to a police release and local coverage. The charges include reckless homicide with a vehicle, alleged speeding more than 35 mph over the posted limit and several traffic offenses. The Cook County State’s Attorney approved the charges, and Dobrolinski is scheduled to return to court on August 14, 2026, according to the Arlington Cardinal.
Legal implications
Reckless homicide in Illinois is defined at 720 ILCS 5/9-3 and is generally classified as a Class 3 felony, according to the Illinois General Assembly. Sentencing ranges for a Class 3 felony are set in the state’s Unified Code of Corrections and typically involve prison terms within that felony class, according to state sentencing tables compiled online.
Speed and safety context
Research shows that higher speeds sharply increase the odds that a crash will result in death or serious injury, a factor investigators weigh closely when reconstructing collisions, according to the Insurance Institute for Highway Safety. In the broader area, Lake County has recently ramped up speed enforcement under a "Speeding Catches Up With You" campaign funded through the Illinois Department of Transportation, part of a larger effort to curb dangerous driving on suburban arterial roads, the county has said.
Arlington Heights police say they remain committed to a thorough and impartial investigation and to pursuing accountability for those affected by the crash. They have asked anyone with additional information to contact detectives. Authorities say Dobrolinski remains in custody ahead of his next scheduled court date on August 14, 2026, after the investigation file was forwarded for prosecution review following completion of the crash reconstruction.
