Investigators say the body of Bertram W. Downes, 27, of New Castle, was recovered from the water near the 600 block of South Justison Street.
Police say the discovery of Downes' body came just a few days after an emergency call about someone struggling in the river.
A search was launched after that incident on August 22nd, but nothing was found.
Police say they have ruled out foul play in Downes' death but, for now, don't know exactly how he died or why he was in the river.
Anyone with information is asked to call the Wilmington Police Confidential Tip Line at 302-576-3990.