Malaysian police said in a statement today that a 46-year-old North Korean man "who sought initial medical assistance at the Kuala Lumpur International Airport" died Monday en route to a hospital.
Police said the man's travel document identified him as Kim Chol, a North Korean born on June 10, 1970. Kim Chol is the name of another brother of Kim Jong Un's, although South Korean government officials told South Korean media that the name in the passport was an alias for Kim Jong Nam.
Jang, an uncle of the two rival brothers, had been considered No. 2 in power but was brutally executed a year after Kim Jong Un took power.
"North Korea is a society where you will be easily executed not because of your difference in political reasons but because of simple reasons — that you angered Kim Jong Un," said Thae Yong Ho, a former North Korean diplomat and the highest-level North Korean official to have defected to South Korea in two decades.
"North Korean society is just the reign of terror."
The two brothers never met in person, according to North Korea analysts in Seoul. But Kim Jong Un always regarded the outspoken Kim Jong Nam as a potential political threat.
For instance, Kim Jong Un built himself up in the image of his late grandfather and the founder of North Korea, Kim Il Sung, to gain popularity and to justify his accession to power. Kim Il Sung is still revered by the people as the pillar of the nation. From the moment he began appearing in public, Kim Jong Un has emphasized striking similarities with his grandfather like gaining weight, wearing the same eyeglasses and having an identical haircut. But it was Kim Jong Nam who grew up close to their grandfather.
The fact that Kim Jong Nam was born to the first legitimate wife of Kim Jong Il took a toll on Kim Jong Un, whose mother was Kim Jong Il's third wife, Koh Yong Hee, who came from a family that defected from North Korea to Japan — which is looked down on in a country where generations of loyalty to the regime is essential.
ABC News' Hong Yoo, from Seoul, and Conor Finnegan, from Washington, contributed to this report. Maureen Jeyasooriar contributed reporting from Kuala Lumpur.