Kim Jong Nam, the half brother of North Korea’s leader who was murdered in a Malaysia airport two years ago, was a Central Intelligence Agency source who met on several occasions with agency operatives, the Wall Street Journal reports.

The Journal, citing a “person knowledgeable about the matter,” said Kim Jong Nam met with CIA agents on multiple occasions and also likely had a relationship with Chinese intelligence officials.

South Korea’s National Intelligence Service and Unification Ministry said Tuesday it could not confirm the report. The CIA declined to comment on the matter when contacted by USA TODAY.

The Journal said Kim Jong Nam had traveled to Malaysia in February 2017 to meet his CIA contact. He was walking through the airport in Kuala Lumpur when he was attacked by two women who smeared VX nerve gas on his face.

The women were accused of colluding with a group of North Korean men who slipped out of Malaysia during the investigation. Charges ultimately were dropped against the women, who told authorities they were paid for what they believed was a stunt for a TV show.

U.S. and South Korean authorities have blamed North Korea for the murder, but Malaysia never made a formal finding on the matter.

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A woman dressed in a traditional gown pays her respects at statues of late North Korean leaders, Kim Il Sung, left, and Kim Jong Il, in Pyongyang, North Korea, Thursday, Feb. 16, 2017. Unaware of reports his eldest son – and current leader Kim Jong Un’s half-brother – was killed just days ago in what appears to have been a carefully planned assassination, North Koreans marked the birthday of late leader Kim Jong Il on Thursday as they do every year. Eric Talmadge, AP

Azalea, whose Korean name is “Dalle”, a 19-year-old female chimpanzee, smokes a cigarette at the Central Zoo in Pyongyang, North Korea Oct. 19, 2016. According to officials at the newly renovated zoo, which has become a favorite leisure spot in the North Korean capital since it was re-opened in July, the chimpanzee smokes about a pack a day. They insist, however, that she does not inhale. Wong Maye-E, AP

A picture released by the Rodong Sinmun, the newspaper of the ruling North Korean Workers Party, on Sept. 8, 2015, shows North Korean leader Kim Jong Un, center front, and Miguel Diaz-Canel Bermudez, second from right, a member of the Political Bureau of the Central Committee of the Communist Party of Cuba and first vice-president of the Council of State, watching an art performance by the Moranbong Band and the State Merited Chorus in Pyongyang, North Korea, on Sept. 7, 2015. Bermudez led a Cuban delegation to North Korea to mark the 55th anniversary of the establishment of diplomatic relations between North Korea and Cuba. Rodong Sinmun, European Pressphoto Agency

Men and women pump their fists in the air and chant “defend!” as they carry propaganda slogans calling for reunification of their country during the “Pyongyang Mass Rally on the Day of the Struggle Against the U.S.,” attended by approximately 100,000 North Koreans to mark the 65th anniversary of the outbreak of the Korean War at the Kim Il Sung stadium, Thursday, June 25, 2015, in Pyongyang, North Korea. The month of June in North Korea is known as the “Struggle Against U.S. Imperialism Month” and it’s a time for North Koreans to swarm to war museums, mobilize for gatherings denouncing the evils of the United States and join in a general, nationwide whipping up of the anti-American sentiment. Wong Maye-E, AP

Kim Jong Nam was the oldest son of Kim Jong Il, the despot leader of North Korea for 17 years until his death in 2011. Kim Jong Nam at one time was considered his father’s likely successor before falling out of favor. In recent years he had developed a reputation for living a playboy lifestyle.

Reports of assassinations and purges are not uncommon in North Korea. Five officials were reportedly executed last month for their rolls in a failed summit between North Korea Leader Kim Jong Un and President Trump. Days later, however, senior official Kim Hyok Chol was shown in state media sitting near Kim at a concert.

Contributing: The Associated Press