Fire officials pulled a body from the water of Eastchester Bay Wednesday.
Police say the man's body was discovered floating near Evers Marina in the Bronx around 11 a.m.
They say the man appears to be in his 30s and that he was fully clothed when discovered.
Officials say trauma was not detected on the man's body, and they are not sure how long the body was floating in the water.
Police are still investigating what happened.