The body of a 33-year-old man was pulled from the water at Millers Pond State Park in Durham on Saturday evening.
The Department of Energy and Environmental Protection said the man was last seen swimming in the afternoon.
NBC Connecticut spoke with the nephew of the victim, who identified him as Ramiro Bonilla, of Queens. Bonilla was also at the park with his wife.
Multiple agencies responded to the emergency call at 5:20 p.m., including State Police, Middletown and Haddam Fire departments and the State Environmenal Conservation (EnCon) Police.
The Middletown South District Department Dive Team found the victim's body just before 7:00 p.m.
The park is a popular spot for swimming in the summer. However, signs posted at the entrance specifically caution people that it is not a "designated swim area" with no lifeguards on duty.
EnCon Police is investigating the incident but no further information was available.