Lee Jae-myung, the leader of the opposition Democratic Party, was stabbed to death at a press conference in the country's port city of Busan on Tuesday morning. South Korea's Yonhap news agency reported this information.
Lee Jae-myung narrowly lost the 2022 South Korean presidential election.
Lee Jae-myung was stabbed in the left side of the neck. Police arrested the attacker from the spot.
Lee Jae-myung's neck was cut about 1 cm deep by the stabbing.
Yonhap News Agency reported that Lee Jae-myung was taken to hospital by helicopter after being stabbed.
According to various media reports in the country, Lee Jae-myung was still conscious after being stabbed. He is currently undergoing treatment in the hospital.
Police said Lee Jae-myung's injuries were not life-threatening.