MCDONOUGH, Ga. -- A veteran Henry County Police Officer was injured and a suspect killed after a single shot was fired during a struggle inside a dentist office Thursday morning, according to the Georgia Bureau of Investigation.

The officer, identified by the GBI in an afternoon news conference as Michael Smith, was shot in the face and taken into surgery and listed in critical condition.

Authorities said police began receiving 911 calls from Smile Creators Family and Cosmetic Dentistry, at 378 Jonesboro Rd. in McDonough just after 8 a.m. about a man acting strangely.

When Officer Smith arrived, the suspect, later named as 53-year-old Dimaggio McNelly, became combative according to Natalie Ammons, deputy director of public affairs at the GBI. At that point, Smith deployed his Taser "more than once."

"The Taser proved ineffective," Ammons said. "At some point, a struggle ensued, and the subject lunged at the officer and ... one shot was fired during the struggle. With that one shot, both the officer and the subject were struck."

McNelly was killed by the gunfire, according to Ammons.

Ammons said it was unclear why McNelly was at the business, and staff members said they didn't know who he was.

Authorities said that a cell phone from a staff member showed the disturbance in the lobby. That video has not been released.

An autopsy will be performed by the GBI to determine McNelly's exact cause of death.

According to the GBI, this is the 84th officer-involved shooting that agents have been called to investigate in 2018. The GBI said Officer Smith is the fifth law enforcement officer shot this year in Georgia; in one additional case, an officer was stabbed.

Smith has been with the Henry County Police Department since 2011.