Arriving units found individuals on a tug boat in the Kill van Kull pulling the victim aboard, located just east of the bridge, Bayonne Fire Department Deputy Chief Bill Bartos said.
Bayonne Fire Boat Marine 1 pulled up aside the vessel and transferred the person to their boat.
Firefighters provided medical care on the person as they headed towards the boat launch at 16th Street Park, where they were met by EMS.
The unidentified individual did not survive, Bayonne Mayor Jimmy Davis said.
Other responding agencies include Bayonne police, McCabe EMS, Bayonne Office of Emergency Management, NYPD, NYPD Aviation, FDNY, and PAPD.
The Port Authority Police Department is conducting the investigation.
Click here to follow Daily Voice Jersey City and receive free news updates.