A 30-year-old man was found dead in the lagoon in Marquette Park Thursday morning, Chicago police said. He was spotted in the water unresponsive about 9:40 a.m. near the 3300 block of West Redfield Drive, according to police. CPD Marine Unit divers took him out of the water and he was pronounced dead at the scene. The circumstances weren't immediately known. An autopsy was expected for Friday.