He was taken to the Erie County Medical Center, where he was pronounced dead.
Jackson graduated from the University of Buffalo on Saturday, and his parents were in town for the ceremony.
Police believe the gunman may have been with three other men when they walked up behind Jackson. One of the men fired at least two shots, hitting him.
Police are trying to determine whether a skirmish in a bar earlier was related to the shooting.
NEW YORK AND TRI-STATE AREA NEWS
USEFUL LINKS: