Wilmington police officials said they believed multiple shots were fired by various parties during a soccer match in Eden Park, WPVI-TV, Philadelphia, reported.
Officials said the fatality was one of three suspects police caught up with after they fled the scene in a car. The victim had multiple gunshot wounds and was pronounced dead at a hospital.
Police said one of the other two suspects had sustained a gunshot wound in the park shooting and the other was injured by a police dog, the TV station said.
Their names were being withheld.
Police said they believed the other three gunshot victims -- a 16-year-old boy from Pike Creek who was shot in the head, a 47-year-old man from New Castle shot in the chest and a 34-year-old man from Baltimore shot in the shoulder -- were participating in the annual Marcus Garvey Soccer Tournament at the park.
Two of them were hospitalized in critical condition and the third was treated and released. Their names had not been released.
Police said it was unclear how many shooters were involved.