Police released the images to help identify the man but said the facial features might vary. The victim is a white male and 40 to 60 years old. The victim had no upper teeth and may have worn dentures, police said.
The cause of death is undetermined but police said there were no signs of foul play. The body had been in the water for a significant period.
The man could not be identified using autopsy, DNA or fingerprints.
The man's body was found about 12:30 p.m. Sept. 8, 2011, floating in the Back River at the intersection of Eastern Avenue and Interstate 695 near Essex. A witness told police the body had not been there early in the day.
Anyone with information is asked to call police at 410-307-2020.