The dead man was identified as 29-year-old Sheldon Najair, of Lakes Pen St Catherine.
At about 5:10 a.m. the St Catherine South police was called to Lakes Pen where Najair's severed head was found at a gate.
The police launched an extensive search and the body was located in the nearby river, Rio Cobre. The police are investigating the matter.
No motive have yet been established and no arrests have been made.