Kim Jong Nam, the poisoned half-brother of North Korean leader Kim Jong Un, told a Japanese friend in Malaysia his life was in danger six months before he was killed, a police official told a court on Tuesday.

Two women, Indonesian Siti Aisyah and Vietnamese Doan Thi Huong, have been charged with murdering Kim by smearing his face with VX, a banned chemical poison, at Kuala Lumpur airport on Feb. 13 last year.

They were charged together with four North Koreans, Hong Song Hac, Ri Ji Hyon, Ri Jae Nam and O Jong Gil, who are still at large, with the murder.