A 53-year-old New Jersey man visiting with family in Darien on May 10 found the driver's side front window smashed.
The vehicle owner told police he had returned to his vehicle at about 11:10 p.m. to find the damage to the 2003 GMC Envoy.
Nothing was stolen from the vehicle.
Police later were unable to determine what was used to break the window, which was estimated to have a replacement cost of about $300 to $400.
Numerous other vehicles in the area were unharmed.