Kim Jong Un’s brother was killed more than two years ago, but today we learned of a possible motive for his murder. The Wall Street Journal reports:

Kim Jong Nam, the slain half brother of North Korea’s leader, was a Central Intelligence Agency source who met on several occasions with agency operatives, a person knowledgeable about the matter said.

“There was a nexus” between the U.S. spy agency and Mr. Kim, the person said.

The newspaper adds:

Many details of Mr. Kim’s relationship with the CIA remain unclear. Several former U.S. officials said the half brother, who had lived outside of North Korea for many years and had no known power base in Pyongyang, was unlikely to be able to provide details of the secretive country’s inner workings.

They also said Mr. Kim—who resided mainly in the Chinese enclave of Macau—was almost certainly in contact with security services of other countries, particularly China’s. The CIA declined to comment. Chinese officials didn’t respond to a request for comment.

Nam was killed when two women smeared nerve agent on his face at an airport in 2017. ABC News says:

Murder charges were dropped against the women earlier this year. They had been accused of colluding with four North Koreans who prosecutors said had fled the country the day of the attack.

Lawyers for the women have said they were pawns in a political assassination with clear links to the North Korean Embassy in Kuala Lumpur.