The fight occurred around 7 p.m. Dec. 23 at the Landmark Village Apartments on Landmark Court.
Witnesses told 911 that several people were fighting and one of them had a gun.
Officers arrived and found Dennehy behind the wheel of a 2011 Ford Fusion with a rifle in the backseat that was registered to him, according to police.
Multiple witnesses identified Dennehy as one of two men in the fight who had a firearm, police said.
Police identified the second armed man as Thacker, who witnesses saw fire a gun in the air during the fight.
No one was hit by the bullet, police said.
None of the other people involved in the fight were charged, police said.