A local police agency, which took custody of the man from the military, said Wednesday it will send him to the immigration office for deportation.
South Korean soldiers did not fire their weapons, but Monday's incident occurred at a time of high animosity over North Korea's nuclear program.
He's in critical condition and it's unclear whether he will stay alive, given the seriousness of the wound, according to Lee Guk-jong, a doctor at the hospital.
The photos below show the JSA border area dividing the South and North, and the small bridge connecting the two sides called the Bridge of No Return. A U.N. Command helicopter later transported him to the Ajou medical center, according to South Korean officials.
Donald Trump has been "sentenced to death" by the Korean people, North Korea's state media has reportedly said.
The Kaesong Industrial Complex, the industrial park where the two Koreas ran collaborative business models, was shut down on February 10, 2016 by the South Korean government, in response to the North's nuclear and ballistic missile tests. South Korea says it will deport an American man detained for allegedly attempting to cross the mine-strewn border into North Korea.
Dozens of North Korean soldiers have fled to the South through the DMZ over the decades since the peninsula was divided, including two soldiers who crossed the frontier in June. The DMZ, created at the end of the 1950-53 Korean War, serves as a de facto border between the Koreas.
There has been no exchange of gunfire between the two sides, but the South's military said it has raised its level of alertness against any North Korean provocations. While both sides of the DMZ are guarded by barbed wire fences, mines and tank traps, the JSA includes the truce village of Panmunjom which provides the site for rare talks and draws curious tourists. In Monday's incident, it wasn't known if the North continued firing after the defector was officially in the southern part of the Joint Security Area.
The incident occurred at the Joint Security Area, the only portion of the demilitarised zone where troops from the two countries, who have technically been at war for nearly 70 years, stand face-to-face.