They reported shots being fired at Duncan Park, on North Limestone, around 6:30pm on Sunday.
Officers said they found the injured 21-year-old unconscious with no vital signs after receiving a bullet wound to his head.
Police said he was rushed to UK Hospital and listed in critical condition.
Investigators are still trying to figure out if the injured man was the shooter’s target or if he was hit by mistake.
Although police said they have multiple suspects in mind, they are confident there was only one shooter responsible.
They are currently looking for a dark-colored car, possibly a Pontiac Grand Prix.
If anyone was at the park when the shooting happened or has any information about what took place, call Lexington police at (859) 258-3600.