According to the testimony of a Malaysian police official, Kim Jong Nam, the estranged half-brother of North Korean Supreme Leader Kim Jong Un, may have met with a U.S. intelligence official shortly before his assassination last February.

A report that coincided with investigating officer Wan Azirul Nizam Che Wan Aziz’s testimony supported these claims, and further added that forensic analysis of Kim’s computer showed a record of having had a thumbdrive inserted during the meeting, potentially indicating that Kim exchanged files of some sort with the individual purported to be a U.S. agent.

According to Wan, “there was a meeting between Kim Chol (Kim Jong Nam) and an American man, but the police had not been able to ascertain the man’s identity and whether or not he was a spy.”

These details were revealed during questioning from the defense attorneys representing the two women charged with Kim’s murder at the Kuala Lumpur airport. Siti Aisyah from Indonesia and Doan Thi Huong from Vietnam face the murder charges, though four other North Korean suspects managed to evade capture, in large part thanks to pressure levied by the North Korean government that led to a diplomatic row between the two states that lasted for weeks.