After a passerby spotted the body around 9:20 this morning by the Teddy Ebersol ballfields, the Suffolk County District Attorney's office reports.
Detectives have a tentative ID based on his wallet, but have yet to release his name pending notification of next of kin, the DA's office says, adding, however, that he is from the greater Boston area.
There are no immediate signs of foul play, but the exact cause and time of death remain under investigation.
This is the third man's body removed from the river over the past couple of months. On March 27, a man's body was recovered between the Hatch Shell and the Mass. Ave. bridge; on March 15, police recovered the body of a man who had been spotted jumping off the Mass. Ave. bridge on Jan. 1.