Naperville Police Investigate Vehicle Discovered Submerged in Lake

On Thursday, Sept. 25, 2025, just before 11 a.m., divers from the Naperville Fire Department were conducting training exercises in Lake Osborne, located just south of the Naperville Public Safety Campus on Aurora Avenue, when they discovered a submerged vehicle in the southwest portion of the lake.

Naperville Police officers, detectives, and crime scene technicians were called to the scene to assist with the recovery of the vehicle and initiate an investigation. At approximately 3:40 p.m., the vehicle was removed from the lake and identified as a 1992 Nissan Maxima. 

Using the vehicle’s older license plate number, investigators determined that the vehicle was connected to an ongoing Berwyn Police Department investigation into the disappearance of Hiep Luu, who was reported missing in 2003. Suspected human remains were located inside the vehicle but have not yet been identified. The DuPage County Coroner’s Office was called to assist with the investigation and will handle identification of the deceased.

Naperville Police divers returned to the scene today, Sept. 26, to continue the search for additional evidence.

The death investigation is being led by the Naperville Police Department in cooperation with the Berwyn Police Department, which continues to handle the missing person’s case.

Anyone with information that may assist in the death investigation is encouraged to contact the Naperville Police Investigations Division at (630) 420-4138.

Anyone with information relevant to the missing person case should contact the Berwyn Police Investigations Division at (708) 795-2160.

About Naperville: Located 28 miles west of Chicago, Naperville, Ill., is home to approximately 150,000 people. This vibrant, thriving city consistently ranks as a top community in the nation in which to live, raise children and retire. The city is home to acclaimed public and parochial schools, the best public library system in the country, an array of healthcare options and an exceptionally low crime rate. Naperville has ready access to a variety of public transportation, housing and employment options. The city’s diversified employer base features high technology firms, retailers and factories, as well as small and home-based businesses. Residents also enjoy world-class parks, diverse worship options, the opportunity to serve on several City boards and commissions, a thriving downtown shopping and dining area, a renowned outdoor history museum known as Naper Settlement and an active civic community. For more information, please visit our website at www.naperville.il.us.