According to the police, Smith entered the airport around 3:30 p.m. in the pre-security baggage claim area of the South Terminal. He reportedly went up the escalators, pulled out a handgun, and "intentionally shot himself in the upper left torso."
Nearby witnesses were able to kick the firearm out of Smith's hand and notify law enforcement.
"He's a convicted felon," Major D. Wilson, of APD, said in a news conference. "Obviously, his conduct was of such a reckless nature, with disregard for the traveling public, for those who are around him."
Police said officers quickly secured the scene, including the firearm and the surrounding area, and confirmed that no other individuals were injured.
The victim was taken to a nearby hospital and was alert, conscious and breathing at the time of transport, authorities said. Smith is currently in stable condition and will be transported to jail following his release from the hospital, they added.
Airport operations were also not affected, airport authorities told Fox News Digital.