A Georgia man who fatally shot two people inside a liquor store and wounded his parents killed himself during an exchange of gunfire with a sheriff's deputy, investigators said Friday, reports the Associated Press.

An autopsy on the body of 36-year-old Jeffrey Pitts shows he died by "contact range gunshot wound of head," according to a Georgia Bureau of Investigation news release.

Pitts went to the liquor store in Conyers, about 25 miles southeast of Atlanta, on Sunday afternoon, and he and a clerk may have had an argument over an unpaid bill, Rockdale County Sheriff Eric Levett told reporters Monday.

Pitts returned to the store a few hours later with an assault rifle and shot the clerk and a customer, Levett said. Pitts fled when another customer in the store returned fire, Levett said.

Pitts returned home and shot his parents, and then exchanged gunfire with a deputy who responded to a 911 call of a person shot, investigators said.

In dash-cam video released today, law enforcement officers can be heard saying the suspect is on the ground, with his back to them, that he's wearing a bullet-proof vest and he appears to be on top of his gun.