CHICAGO (WLS) -- Crews were called to Lake Michigan after a car was found submerged in the water at the 31st Street boat ramp around 2:15 p.m. on December 14, 2015.The body of a 58-year-old man was found in the water nearby. Officials said he was pronounced dead at Northwestern Memorial Hospital.The victim was identified as Mark Grabowski, of the 4400-block of North Knox Avenue, the Cook County medical examiner's office said Tuesday.Chicago police said the car and body may have been in the water for up to four hours. A death investigation is underway.