• North Korean Leader Kim Jong Il, bottom left, poses with his first-born son Kim Jong Nam, bottom right, in this 1981 family photo in Pyongyang, North Korea.

North Korean Leader Kim Jong Il, bottom left, poses with his first-born son Kim Jong Nam, bottom right, in this 1981 family photo in Pyongyang, North Korea. (Photo : Getty Images/Choongang Monthly Magazine)

After the arrest of two women suspects in the killing of North Korean leader Kim Jong Un's elder half-brother, Kim Jong Nam, the hunt is still on for four men as authorities consider the possibility of an an organized plot. The theory of South Korean officials is that Jong Nam's tyrant brother has something to do with it.

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South Korean officials believe Jong Nam was poisoned with a spray or a needle, Bloomberg quoted South Korea's Intelligence Committee Chairman Lee Cheol Woo saying before reporters in a press conference on Feb. 15, Wednesday. It was after Lee met the intelligence chief.

Jong Nam died on Feb.13, Monday, in a crowded departure terminal in Malaysia's airport. He staggered through the Malaysian airport's fourth floor looking for help when an airport service counter receptionist found him.

Clinging to life, the 45-year-old was assisted to Malaysia's airport clinic on the third floor. He quickly became unconscious and was brought to Putrajaya Hospital adjacent to  Kuala Lumpur airport. He did not make it though, and was declared dead on arrival.

The mysterious killing of the casino-loving traveler triggered a police manhunt. The two women who were suspected to have toxic sprayed Jong Nam's face are Doan Thi Hoang, 28, and Siti Aisyah, 25.

Hoang was labeled the "LOL assassin" because she was wearing a shirt emblazoned "LOL." Meanwhile, Aisyah was reportedly made to believe she was simply doing pranks for a television show similar to "Just For Laughs" which uses a hidden camera.

Aisyah is said to have been  persuaded in the past to do some pranks in spraying a substance into a person's eyes for money. She reportedly did not have the idea that her recent act was an assassination attempt. Police also detained her boyfriend but only to help in the investigation.

The family and relatives of the murdered North Korean are placed under police protection in Macau,  South China Morning Post reported. Jong Nam's second wife and their son and daughter have been living in Macau while his first wife and son live in Beijing.

The following clip has a scoop of Jong Nam's murder: