Chicago police said their preliminary investigations shows that two groups of people were involved in a "personal altercation" around 7:45 p.m. in the park.
WATCH: Chicago police update on Washington Park shooting
Chicago police update on Washington Park shooting
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Multiple shots were fired. A total of seven people were shot, and one of them died, CPD said.
Police said a 43-year-old man was shot in the back of the head and taken to University of Chicago Medical Center, where he was pronounced dead.
A 30-year-old man was shot in the left shin, a 39-year-old man was shot in the right ankle, a 27-year-old woman was shot in the upper left thigh, and a 22-year-old man was shot twice in the left elbow, police said. All four of them were taken to University of Chicago Medical Center in good condition.
A 19-year-old man was shot in the upper right shoulder and self-transported to Insight Hospital in good condition, police said.
A 20-year-old man was shot multiple times in the body and taken to University of Chicago Medical Center in critical condition.
Police believe all of the victims were in the two groups involved in the altercation.
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No one is currently in custody. Police are asking anyone with information to contact Area 1 detectives or use their tip line at 833-408-0069. A $15,000 reward is available for information leading to arrests.