North Korean leader Kim Jong Un’s half-brother Kim Jong Nam, who was killed in a Malaysian airport in 2017, was a CIA informant who met with agency personnel on several occasions before his death, according to The Wall Street Journal, citing a person knowledgeable about the matter.

At the time of his death, Kim had not lived in North Korea for several years, and he was likely in contact with the intelligence services of other countries as well, including China, the Journal reported Monday.

Kim Jong Nam was killed in Kuala Lumpur when two women smeared the nerve agent VX on his face. U.S. and South Korean officials believe Pyongyang is responsible.

Read more at The Hill.