The lawyer of a Vietnamese woman accused of murdering the half-brother of North Korea’s leader has called for a second autopsy on the body.

Kim Jong-Nam was poisoned with a lethal dose of VX, which is listed by the United Nations as a weapon of mass destruction, after he arrived to board a flight at Kuala Lumpur International Airport last month.

Airport CCTV footage shows two women approaching him and smearing his face with a cloth.

Indonesian Siti Aisyah (25) and Doan Thi Huong (28) from Vietnam, have been charged with the murder and face the death penalty if found guilty.

Huong’s lawyer said  Malaysia does not have the necessary expertise in identifying the chemical weapon, adding that he planned to request a second post-mortem.

While North Korea has not acknowledged the dead man’s identity, it has repeatedly criticised the murder investigation and has accused Malaysia of conniving with its enemies.

A diplomatic dispute erupted last month when Malaysian police rejected North Korean diplomats’ demands to hand over Kim’s body.