He has been identified as 19-year-old Toby Allen Gale of Chester.
The medical examiner said an autopsy on Friday confirmed that Gale died of blunt force trauma to the head. His death has been ruled a homicide.
The body was found in the 100 block of Central Avenue shortly after 11:00 a.m. Thursday.
That location is between the Delaware River and Route 291 and a few blocks from the Commodore Barry Bridge.
Investigators say the body was found near a construction site near a footing of the bridge by city highway workers.
Police say Gale's body was bound and wrapped in plastic trash bags with a blanket over his head.
There is no word yet on any suspects in this case.
Anyone with information is asked to contact Detective James Nolan at (610) 447-8429.